BG100361A - Process for differentiating organic foodstuff residues on hard surfaces - Google Patents

Abstract

A process is disclosed for differentiating organic foodstuff residues according to their type on hard surfaces by applying a solution that contains a combination of at least two dyes, of which at least one is hydrophilic and at least one is hydrophobic, on the hard surface, then optically determining the residue type thanks to their specific colouring. Also disclosed are liquid compositions of dye mixtures and their use.

Description

TECHNICAL FIELD

The invention relates to a method for differentiating organic food residues on solid surfaces by suitable combinations of dyes and liquid composition for its application, which will find application as an effective means of cleaning organic residues.

BACKGROUND OF THE INVENTION

The production or processing of foodstuffs or other materials containing organic ingredients of animal or vegetable origin results in contamination of appliances, work surfaces and areas. Such contamination can lead to the formation and development of bacteria, fungi and microorganisms. This, in turn, could significantly affect the quality of the products to be processed and, therefore, maintaining a high level of hygienic conditions in order to avoid such an effect.

A high level of hygiene in a food business is maintained through regular cleaning and regular disinfection. Characteristic of food businesses is the presence of inorganic salts coated on organic contaminants such as proteins, fats, low and high molecular weight carbohydrates, which are most often mixed together.

Cleaners of different composition are used to remove these contaminants. The choice of a suitable detergent is generally determined according to the type of contamination to be removed. Therefore, if the type of contamination is known, the most suitable cleaner may be selected. However, different combinations of detergents lead to differences in the cleansing effect of protein, fat and carbohydrates. In doing so, slight traces of contamination, which harbor a microbiological risk, may remain in the cleaning process.

So far, the hygiene level has been checked exclusively by bacteriological methods using cultures. Such methods of checking the hygiene level are inappropriate since they can only be used to identify living microorganisms (bacteria and fungi). However, by bacteriological methods it is not possible to identify the organic contaminants that have favored the development of the bacteria. Therefore, bacteriological methods are possible

to immediately determine the effect of cleaning. In addition, bacteriological methods are time consuming and may take several hours, even several days, until a final result is obtained.

The control of hygiene by bacteriological methods could be falsified by disinfection, which does not preclude the collection of organic contaminants, which are the cause of the development of resistant microorganisms.

Sampling from different points on the surface does not guarantee that the entire surfaces of appliances and surfaces are at the same hygiene level.

There is a method of cleaning and controlling the effectiveness of cleaning and hygiene by applying a solution of a mixture of dye cleaner or

combination of dyes on surfaces to be cleaned.

Organic contamination that remains on the surfaces after cleaning is found by staining.

A disadvantage of the known method is the inability to determine the type of residues after cleansing, whether it refers to residues from fats, carbohydrates or proteins.

/ WO

An object is known by a method of detecting contamination by sequential treatment of the same with a dye solution and developer.

90/14591 /.

A disadvantage of the known method is the inability to identify the type of contamination, regardless of their location. / EP-A-0 347 494

A method for determining ??? with solution of suitable dyes in organic materials from tanks or pipelines is known. / US-A-4 745 797 /.

The staining of food residues by means of indicators (erythrosine) is also known in odontology. Here, the indicators are used to make the plaque visible on the teeth.

The disadvantage of this method is the inability to determine the type of food residue.

A major advantage of the present invention is to provide a method that determines the contamination by type of organic debris on the surface and allows additional cleaning to be carried out by means of special cleaning agents, as well as identifying in the future suitable cleaning agents or combinations of cleaning agents to avoid additional cleaning.

TECHNICAL NATURE

It is an object of the present invention to provide an easily applicable method of differentiating organic pollutants according to their type, i.e., fats, proteins and carbohydrates (low and high molecular weight), directly onto a solid surface before or after cleaning.

The essence of the invention is to provide a method for differentiating organic food residues on solid surfaces in which a solution containing a combination of at least two dyes, at least one of which is hydrophilic and at least the second is hydrophobic. is applied to solid surfaces, after which the residues of organic products are optically determined on the solid surfaces by their specific coloration.

Organic residues are fats, proteins and / or carbohydrates.

Hydrophilic dyes are selected from erythrosine and poncho 4R, and hydrophobic dyes are selected from curcumin, carotene, riboflavin and ceres blau RR.

The dye combination consists of erythrosine and curcumin or.-Carotene.

An additional component of the dye combination is the Ceres Blow RR.

The combination of at least two of the dyes is contained in

the solution in the 0.05 to 3 percent by weight. Like solvent of the combination of at least two dyes used water with pH = 8. Like solvent of the combination of at least two

a mixture of water and an organic solvent is used.

The weight ratio of water and the organic solvent mixed with it is in the range of 20: 1 to 1:20, preferably in the range of 10: 1 to 1:10, and in particular 2: 1 to 1: 2.

An organic solvent which can be mixed with water is used as the solvent of the combination of at least two dyes.

The solution further comprises at least one non-ionic, cationic or amphoteric surfactant.

The surfactant is contained in the solution in a fraction of 0.05 to 2% by weight.

Liquid composition according to the present invention comprising a solvent and dyes, characterized in that it contains a combination of at least two dyes, at least one of which is hydrophilic and at least the second is hydrophobic.

A liquid composition in which one component of the dye combination is erythrosine and the other component is curcumin or carotene.

Liquid composition in which an additional component of ceres blau is added to the dye combination.

Liquid composition in which water with pH = S, a water miscible organic solvent or a mixture of water with a water miscible organic solvent is used as the solvent.

Liquid composition in which the proportion of the dye combination is 0.05 to 3% by weight.

Liquid composition containing an additional 0.05 to 2 weight percent of surfactant.

A liquid composition that is used to differentiate organic food residues according to their type on solid surfaces.

The advantages of the invention are that:

The inventive method of the present invention provides, in the development of a cleaning agent, a simple method for qualitatively assessing the cleaning effectiveness of cleaning agents by different coloring of individual components of contamination showing the degree of removal by the formula of the cleaning agent.

The method user is able to:

1. Determine the type of organic contamination, the location of the most contaminated surfaces, as well as the type of cleaner prior to cleaning itself, and treat the more heavily contaminated surfaces reliably.

2. To check the effectiveness of the cleaning after its completion and to select the appropriate special cleaner for the non-removed contaminant component.

3. To easily identify the shortcomings of the cleaning agent applied to the individual contaminants so that it can make the right choice of cleaning agent in the future.

4. Remove any organic contamination remaining after cleaning with a special cleaning agent.

ANNEX / USE / INVENTION

The terms hydrophilic dyes, respectively hydrophobic dyes for the purposes of the present invention are defined as follows:

The hydrophilic nature of a substance is determined by its ability to penetrate and remain in the water

The hydrophobic nature of a substance is determined by its ability not to penetrate or remain in water / Rompp Chemie Lexikon, 9. Auflage, Band 3 (1990), Georg Tieme

Velag, Seiten 1892 and 1893 /.

In the spirit of the foregoing definitions and within the meaning of the present invention, hydrophilic harkter dyes will be understood to be dyes that are water-loving and easily and well dissolved at room temperature.

Hydrophobic dyes will be understood to mean dyes that are water repellent, that is, insoluble or difficult, or slightly soluble in water at room temperature.

The characteristics of the dyes associated with the invention are available in the following standard editions:

Kosmetische Farbemittel, 3rd Auflage, 1991,

Herausgeber Farbstoffkommission der Deutschen

Forschungsgemeinschaft (DFG), VCH Verlagsgesellschaft GmbH.

Color Index, Third Edition, Vol. 1 till 9, published by The Society of Dyers and Colourists.

Fats, proteins and / or carbohydrates that can be mixed together or coexist independently are considered organic residues. Determination of the type of contaminant residue is possible by the method of the invention by means of

solution.

The method of the invention provides, in the presence of a developed cleaning agent, an extremely simple method for qualitatively evaluating the cleaning effectiveness of cleaning agents, whereby one trial contamination / fat / protein / starch / first with the cleaning agent tested is treated thereto. and then with the liquid composition of the invention by a standardized method.

By which different components of the dirt can be colored differently, it is possible to know which component could be removed less or more strongly by the formula of the cleaning agent. Following such an experiment, appropriate formulation improvements can be made by detecting the type of appropriate cleaner.

The method of differentiating organic food residues on solid surfaces of the invention allows contamination prior to cleaning to make an appropriate selection of a cleaning agent. In this case, after cleaning, it would be possible to check its effectiveness on the one hand and to select an appropriate special cleaning agent for cleaning.

the non-removable contaminant component.

For the cleaning of large production plants and enterprises respectively, sample critical points can be determined by the HACCP (Hazard Analysis of Critical Control Points) method. In which case, after cleaning, the critical points can be sprayed with the liquid composition of the invention, and then, depending on the results obtained, appropriate effective measures can be taken.

The application of the inventive solution to the hard surfaces to be tested can be accomplished by known methods, in particular by spraying, brushing, pouring or smearing the inventive solution onto the surface. This can also be done with pre-rinse water.

The present exemplary list of dyes that may be used in the spirit of the present invention lists hydrophilic dyes and hydrophobic dyes. With respect to the instructions given in the Color Index Nummer C.I., DFG-Name, Synonyma and EG-Nummer, reference is made to the two standard editions cited above:

Dyes Color Index with hydrophilic DFG-Name character: Synonyma EG Nmber 10020 C-ext. Grun 6 Naphtolgrun B, L-ext. Grun 1 petro-green B. 13015 C-Gelg 9 Echtgelb - lasting yellow 14270 C-Gelg 12 Chrysoin S - 14700 C-Rot 57 Ponceau \ SX, FD&C Red 4 14720 C-Rot 54 Azorubin, Carmaisine, L-Rot 1 E122 14815 C-Rot 49 Scharlach GN, Scarlet GN E125

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Dyes hydrophilic: Color Index DFG-Name Synonyma EG Number 15510 C-ext. Orange Orange II&C, Orange 4 - 15620 C-WR Rot 13 - - 15980 c-Orange 9 Orange GGN Elll 15985 C-Orange 10 GelborangeS, sunsetYellow FCF FD&C Yellow 6, L-Orange 2 E110 16035 C-Rot 60 Allura Red AC, FD&C Red 40 - 16185- C-Rrot 45 Amranth, L-Rot 3 E123 16230 C-ext. Orange 11 Orange GG - 16255 C-Rot 47 Ponceau 4R, L-Rot 4, Cochenilierot A E124 16290 C-Rot 48 Ponceau 6R E126 17200 C-Rot 58 Fast Acid Magenta B, D&C Row 33 18050 C-ext. Rot 63 Amidonaphtolot G, Order 26 L-Rot 12 18130 C-WR Rot 4 Supranolbriliantrot 38 - 18690 C-WR Orange 9 Zaponechtgelb R, Perln Fast Yellow 6 18736 C-WR Orange 8 Palantinechtrot RN - 18820 C-WR Gelb 9 Flavazin L - 18965 - Yellow 26 - 19140 C-Gelb 10 Tartrazine, FD&C Yellow 5, L-Gelb 2, Permanentgelb NCG 20170 C-ext.Brawn 4 Resorcinbroun, D&C Brown 1 - 20470 C-WR Schwarz1 Amidoschwarz 10 B - 24790 C-WR Rot 18 Supranolot BR - 27290 - Brillantcrocetin MOD - 27755 c-schwarz Ί Schwarz 7984 E152 28440 C-Schwarz 6 Brilliantschwarz BN, Brilliant Black E PN, L-Schwarz 1 E151 40215 C-WR Orange 1 - - 42045 C-ext. Blau 13 Patentblau VR -

Dyes Color hydrophilic: DFG-Name Synonyma EG Index 42051 C-Blau 20 Patentblau V, Number E131 42053 C-Grun 12 Patent blue V, L-Blau 3 Fast Green FCF, 42080 C-WR blau 11 FD&C Green 3 Patentblau A - 42090 C-Blau 21 Patentblau AE, - 42100 C-WR Grun 5 Brilliant Blue FCF, FD&C Blue 1, L-Blau 4 42170 C-ext. Grun 10 Alkaliechtgrun 10 G, - 42510 C-WR Violett 8 L-ext. Grun 2 Fuchsin, Magenta - 42520 - Neufuchsin, New Magenta - 42735 C-ext.Blau 4 Brillantwollblau FFR - 44045 C-WR Blau 8 Victoriabla B - 44090 C-Grun 4 Wollgrun S, E142 45100 Brillantsauregrun BS, L-Grun 3 Sulfohodamine B 45190 C-WR Violet 5 Echtsaureviolett ARR, L-ext. - 45220 C-WR Rot 16 Violett 2 Sulforhodamine G 45350 C-ext. Gelb 16 Fluorescein, Uranine, - 45380 C-Rot 30 D&C Yellow 7/8 Eosin, Eosine, 47005 C-Gelb 11 D&C Order 21/22 Row 3, L-Rot 11 Chinolingelb E104 50325 C-WR ViolettlO Quinolineyellow, L-Gelb 3 Wollechtviolett B E104? 50420 - Niprosin GF wasserloslich - 59040 C-ext. Gelb 24 Pyranin, Pyranine - 60730 C-ext.Violett21 Anthralanviolett 3b, -

Ext. D&C Violet 2

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Dyes with hydrophilic character: Color Index DFG-Name Synonyma EG Number 61570 C-Grun 11 Alizarincyangrun G, D&C Green 5 61585 C-WR Blau 10 - - 73015 C-Blau 19 Indigotine, Indigocarmin, FD&C Blue 2, L-Blau 2 E132 74180 C-WR Blau 12 Heliogenblau SBL, Siriuslichtturkisblau GL 75815 C-Grun 8 Chlorophyllin-Cu-Complex E141 - C-Rot 53 Beetenrot, Beetroot red E162 - C-Rot 52 Anthocyane, Anthocyans E163 Dyes with hydrophobic character: Color Index DFG-Name Synonyma EG Number 11920 C-Orange 1 Sudanorange G - 12150 C-Rot 2 Solvent Red 1, Food Red 16 12700 - Sudangelb.38 - 21230 C-ext. Gelb21 Sudangelb GRN, L-ext. Gelb 1 26100 C-ext. Rot 56 Sudan Order BK, D&C Order 17 - 40800 C-Orange 11 .-Carotin, L-Orange 3 E160a 40820 C-Orange 167 Apocarotinal, L-Orange 8 E160e 40825 C-Orange 17 Apocarotinsaure-ethyl-ester L-Orange 9 40850 C-Orange 15 Canthaxanthin E161g 45370 C-Rpt? 27 D&C Orange 5 - 47000 C-ext. Gelb23 Chinolingelb A spritl. D&C Yellow 11 56238 C-WR Gelb 16 Hostasolgelb 3G - 61554 Solvent Blue 35 Fettblau B, Sudanblau 11 61565 C-Grun 10 Alizarincyaningrun fettl. D&C Green 6 60725 C-ext. Violett Irisol spritl., D&C Viollet 2 -

Dyes Color Index with hydrophobic DFG-Name character: Synonyma EG Number 69800 C-Blau 18 Indanthrenblau RS, Indanthrone E130 7300 C-Blau 22 Indigo, D&C Blue 6 - 75120 C-Orange 12 Annatto, Orleans, Bixin, NOr-Bixin, L-Orange 4 E160b 75125 C-Orange 14 Lycophin, L-Orange 6 E160d 75130 C-Orange 11 Carotin, Carotene, L-Orange 3 E160a 75135 C-Orange 15D Xanthophyle, L-Orange 7d Rubixathin E161d 75170 - Guanine - 75300 C-Gelb 15 Curcumin, Curcumin Turmeric, L-Gelb 7 E100 75810 C-Grun 8 Chlorophyll-Cu-Complex L-Grun 2 E140 - C-Gelb 14 Riboflavin, Lactoflavin Vitamin B., L-Gelb 6 E101 - C-WR Grun 3 Bromcresolgrun, Bromcresol gren - - C-WR Blau 3 Bromthymolblau, Bromthymol blue - C-Orange 134 Capsanthin, Capsorubin, L-Orange 5 E160c - - Solvent Blue 97, Ceres Blau RR

According to a preferred embodiment of the present invention, erythrosine / C.1.45 430 is used as hydrophilic dyes; E 127 / and poncho 4R / C.1.16 255; E 124 /.

As hydrophobic dyes according to the invention, curcumin / C.1.75 300 is preferred; E 100 /,.-Carotene / P.1.40 800 430; E 160a /, riboflavin / E 101 / and tres RR bal.

According to another preferred embodiment of the present invention, a combination of two different dyes is used, one of which is hydrophilic and the other hydrophobic. In this regard, it is preferred, in this respect, that one component of the dye combination is erythrosine and the other component is curcumin or.-Carotene.

The present invention includes a dye combination of three different dyes (three-component system), of which at least one is hydrophilic and at least the second is hydrophobic. In such systems, it is irrelevant whether the third additional dye is hydrophilic or hydrophobic. In the context of the invention, the binary combinations of dyes mentioned above are used for such three-component systems, and the Ceres Blow RR is used as an additional dye component.

Like the above embodiments, the present invention encompasses dye combinations of four different dyes as well as more different dyes.

In another preferred embodiment of the invention, the dye combination of at least two dyes is contained in the solution in a ratio of 0.05 to 3 weight percent, preferably 0.05 to 2 weight percent, and in particular a ratio of 0.05 to 1 weight percent.

The binary dye ratio is 1:10 to 10: 1, preferably 1: 5 to 5: 1, and especially 1: 2 to 2: 1. However, as a rule, mixtures in a 1: 1 ratio produce good results.

For three- and four-component dye systems, it is valid to require that one dye be no more than 10-fold, preferably 5-fold excess, relative to the small-dye dye. $

For a combination of more than four different dyes, the corresponding ratio is valid. However, combinations in which the dyes are in equal proportions are generally preferred.

The invention also relates to liquid compositions containing a suitable solvent and a combination of at least two dyes, at least one of which is hydrophilic and at least the second is hydrophobic. Such a combination of dyes makes it possible to optically distinguish residues of organic haran products on solid surfaces, depending on their type.

Particularly good results are obtained by differentiating the type of contaminants by their specific coloring when one of the components of the dye combination is

erythrosine and the second component is curcumin or.-carotene. For three-component dyeing systems, it is preferable to use the dyes recommended above as well as the additional component of the Ceres Blow RR dye combination according to the invention.

A suitable solvent for the liquid compositions of the dye combination may be water at pH = 8. The appropriate pH for the solubility of the dye combination should be determined individually each time using suitable bases, especially alkali metal hydroxides (NaOH, KOH) or alkali metal carbonates / sodium. carbonate. Water thus prepared with respect to the pH in the alkaline range is also capable of dissolving the hydrophobic dyes mentioned above.

Another particularly suitable solvent for the dye combination is a mixture of water and a miscible organic solvent. Preferably the miscible organic solvent. Preferably, the miscible organic solvent with water is used by weight, water to water miscible organic solvent in the range from 20: 1 to 1:10, and in particular from 2: 1 to

1:20, preferably 10: 1

1: 2. In this case, the addition of bases to the solution may be omitted.

Water-miscible organic solvents are particularly suitable for monovalent and divalent alcohols, miscible with water, especially ethanol, propanol, isopropanol, butanol, ethylene glycol, propylene glycol, butylglycol, methyldiglycol, ethylenediglycol, butyldiglycolene or bipyldiglycol. These water miscible organic solvents also act as agents of the solution. In this connection it should be noted as an agent of the solution and the mixture of triethanolamine and caprylic acid or sodium cumulus sulfonate in a ratio of 1: 1, optionally in the form of aqueous solutions thereof.

The dye combination can also be dissolved in a suitable pure organic solvent. Particularly mentioned above as solvent mixtures should be noted here.

water miscible organic solvents or theirs

A solvent of the dye combination may also be a mixture of triethanolamine and caprylic acid or sodium cumolsulfonate in a 1: 1 ratio, optionally in the form of an aqueous solution.

The dye combination solution may also contain, in addition, the usual non-ionic, cationic, anionic or amphoteric surfactants or mixtures thereof which are permeable to the combination

different dyes or protein layers from the dyes and be able to reach and color the carbohydrates they contain.

To the solution of the dye combination, surfactants in one particle of 0.05 to 2 weight percent may be added, preferably 0.05 to 0.5 weight percent, and especially preferably 0.05

As anionic up to 0.15% by weight.

For example, surfactants such as sulfonates and sulphates, especially alkene and hydroxyalkanesulfonates or mixtures thereof, alkanesulfonates, estersulfonates, sulfuric fatty acid glycerin esters / sulfotriglycerides or alkylsulfate or alkylsulfate or alkylsulfate or alkali sulfates or alkali sulfates or alkali sulfates, alkylsulfoic acid, sulfosuccinates, isothionates, taurates, phosphate esters and mixtures thereof.

Recommended non-ionic surfactants are ethoxylated and / or propoxylated alcohols, which are removed from primary alcohols of preferably 9-18 carbon atoms and an average of 1-12 moles of ethylene oxide and / or propylene oxide. Alkyl glycosides may also be used.

Suitable cationic surfactants are, in particular, quaternary (quaternary) ammonium compounds (QAV), quaternary (quaternary) phosphonium compounds (QPV) and amine oxides. Amphoteric compounds should also be mentioned for this purpose.

In addition to the dyes, surfactants or solvents, the usual preservatives may also be contained in the solution.

Immediately after treatment of the test surface with the combination of dyes, differentiation of proteins, fats and carbohydrates (starch) by their coloration can begin. The different colorations of food residues can generally be determined optically with the naked eye in daylight. The coloring can also be made visible, possibly with the help of ultraviolet light, with the help of which the treated surface will more strongly reflect the colors or make them visible at all. In the presence of a mixture of fat, protein and

carbohydrates, mixed colors may be obtained, depending on the quantity of food residues present, one color or another will prevail.

The solutions have a long shelf life as they are stable and the bearing does not affect their properties.

The following examples illustrate the invention subject to the present application without limitation.

EXAMPLES FOR IMPLEMENTATION

Example 1

Fully / fully desalinated water solution, butyldiglycol (as dissolution agent), C-C ..- fatty alcohol-1,6-glucoside (Triton BG 10, Union Carbide commercial product) and dye or dye combination, respectively the quantitative weight ratios indicated in the following table are sprayed onto the test surface (white ceramic tiles) and then the staining is investigated by the specific dyeing of pre-applied pollutants in ordinary light and in UV light.

The fat is bovine fat, the starch is the flour in the form of a dissolved 10% by weight in water, and the protein mixture is whole milk with protein or casein.

liquid composition

Water

47.30%

47.20% 47.10% Solvent Agent

52.50%

47.10%

52.50% curcumin surfactant erythrosine

0.10% 0.10%

0.10% 0.10%

0.10%

0.20%

0.10%

0.20%

0.15%

0.15%

Note: Liquid compositions 1 and 2 are comparative examples

Trials

A / Colors in daylight

liquid composition 1 2 3 4 fat Red yellow yellow pale yellow protein Red yellow Orange Red grieved Red yellow Red pink B / Colors at ultraviolet light / WBPS / liquid composition 1 2 3 4 fat - green / yellow green / yellow green / yellow

protein orange green / yellow red / orange orange

starch green / yellow orange light orange

An equivalent result is also obtained for the dye combination of erythrosine and curmin in a 2: 1 ratio, when a single solvent (butyldiglycol, butylglycol, methyldiglycol,

ethylene glycol, dipropylene glycol monoethyl ether, ethanol, an aqueous solution in 40% by weight of sodium cum sulfate or an aqueous solution in 66% by weight of triethanolamine / caprylic acid (1: 1).

In a mixture with water, butyldiglycol can be replaced by butylglycol, ethylene glycol, methyldiglycol, ethanol or an aqueous mixture in a ratio of 1: 1 triethanolamine: caprylic acid (67% by weight) without finding any effect on the result.

Example 2

For the following, the liquid formulations were used at

47.1% by weight of completely desalinated water, 52.5% by weight of butyldiglycol as a solution agent, 0.1% by weight of triton BG 10 as a surfactant and a total of 0.3% by weight of the corresponding dye combination.

The liquid compositions were applied to the test surface (white ceramic tiles) by spraying, and the staining of the pre-applied impurities (described in Example 1) was determined in daylight and in ultraviolet light (366 pt).

The results are reflected in the following table.

TABLE / Three-component dye combinations /

Type of pollution

Dye combination Fat She was sad Protein Light 1 erythrosine: 1 curcumin: 1 poncho 4R yellow pink orange living room 1 erythrosine: 1 curcumin: 1 poncho 4R yellow light yellow Orange orange UV black

1 erythrosine: 1 curcumin: 1 lactoflavin yellow pink Orange living room 1 erythrosine: 1 curcumin: 1 lactoflavin yellow light dark Orange Orange UV366nm 1 erythrosine: 1 curcumin: 1 . carotene light pink Orange yellow yellow living room 1 poncho 4: 1 curcumin: 1 . carotene yellow light Orange living room Orange 1 poncho 4: 1 curcumin: 1 . carotene yellow Orange yellow UV Soot Orange

............- U--

3. Other experiments were conducted with the following formulations (binary and ternary combinations):

Biner dye combination / 1: 1 /

Three component dye combination / 1: 1: 1 /

Dye combination

Triton BG 10 / 0.1

Solvent agent / methyl diglycol /

Water / fully desalinated /

0.4% by weight% by weight

5.0% by weight

94.5% by weight

0.6% by weight

0.1% by weight

5.0% by weight

94.5% by weight

The liquid compositions were sprayed onto the test surface (white ceramic tiles) over the impurities described above, separately and as a three-component mixture, and the stains were examined and determined in daylight.

The results are reflected in the following table:

Table 2

Erythrosine / erythrosine / erythrosine / erythrosine / erythrosine / erythrosine / .carotene riboflavin ceres blow RR riboflavin ceres blow RR 1: 1: 1.-Carotene.-Carotene riboflavin ceres blow RR 1: 1: 1

1: 1: 1

Fat yellow bovine fat blue yellow separately yellow and blue blue

Starch / flour / red red red red red red

Protein / casein / Orange Red Red Orange Orange/ Red Red Three Red NI Red red, red, NI compo- yellow and yellow and yellow and nent Orange orange orange a mixture points stripes points

/ N.I. = not measured /

Claims (19)

Patent Claims 1. A method for differentiating residues of organic food products on solid surfaces by treatment with a dye solution, characterized in that the solution comprises a combination of at least two dyes, at least one of which is hydrophilic and at least the second has the hydrophobic character is applied to solid surfaces, after which the type of organic product residues on the solid surfaces is optically determined by their specific coloration. 2. The method according to claim 1, wherein the residues of the organic products are fats, proteins and / or carbohydrates. Method according to claims 1 and 2, characterized in that the hydrophilic dyes are selected from erythrosine and poncho 4R and the hydrophobic dyes are selected from curcumin, carotene, riboflavin and ceres blau RR. Method according to one or more of claims 1 to 3, characterized in that the dye combination consists of erythrosine and curcumin or.-Carotene. The method of claim 4, wherein the additional component of the dye combination is a Ceres Blow RR. A method according to one or more of claims 1 to 5, characterized in that the combination of at least two of the dyes is present in the solution in a proportion of 0.05 to 3% by weight. A method according to one or more of claims 1 to 6, characterized in that water of pH = 8 is used as the solvent of the combination of at least two dyes. A method according to one or more of claims 1 to 6, characterized in that a mixture of water and an organic solvent is used as the solvent of the combination of at least two dyes. A method according to claim 8, characterized in that the weight ratio of water and the organic solvent mixed therewith is in the range of 20: 1 to 1:20, preferably in the range of 10: 1 to 1:10, and in particular from 2: 1 to 1: 2. A method according to one or more of claims 1 to 6, characterized in that an organic solvent that can be mixed with water is used as the solvent of the combination of at least two dyes. A method according to one or more of claims 1 to 10, characterized in that the solution further comprises at least one non-ionic, cationic or amphoteric surfactant. 12. The method of claim 11, wherein the surfactant is contained in the solution in a single portion of 0.05 to 2 weight percent. 13. Liquid composition consisting of a solvent and a dye, characterized in that it contains a combination of at least two dyes, at least one of which is hydrophilic and at least the second is hydrophobic. 14. Liquid composition according to claim 13, characterized in that one component of the dye combination is erythrosine and the second component is curcumin or carotene. 15. Liquid composition according to claim 13, characterized in that an additional component is added to the dye combination. 16. Liquid composition according to one or more of Claims 13 to 15, characterized in that water with a pH = 8, a water miscible organic solvent or a mixture of water with a water miscible organic solvent is used as the solvent. . Liquid composition according to one or more of claims 13 to 16, characterized in that the proportion of the dye combination is 0.05 to 3% by weight. by 18. Liquid composition according to 13 to 17, characterized in that one or more of the claims further comprises 0.05 to 2% by weight of surfactant. 19. Liquid composition according to one or more of the claims of 13 to 18, which is used to differentiate organic food residues according to their type on solid surfaces.