2 - Hydroxy - 4 - amino - 1,3,5 - triazines, substituted in the 6-position with a hydrocarbon or substituted hydrocarbon radical, are prepared by heating a monocarboxylic acid with dicyandiamide to 120-250 DEG C., preferably 140-200 DEG C. In an example, 2-hydroxy-4-amino - 6 - hendecyl - 1,3,5 - triazine is prepared by heating equimolecular proportions of lauric acid and dicyandiamide in nitrogen to 185 DEG C. for 2 hours, and extracting the product with aqueous caustic soda solution and ether. Other specified monocarboxylic acids which may be used are acetic, butyric, caprylic, stearic, oleic and benzoic acids, the monochlorinated acids of palm-kernel oil, the acids of palm oil, palm-kernel oil and hardened rape oil, tall oil and rosin. Some of the above triazine derivatives are also obtainable by reacting an aliphatic carboxylic acid chloride with potassium hydrosulphide, treating the product with dicyandiamide to yield a 2-mercapto - 4 - amino - 6 - alkyl - 1,3,5 - triazine, and oxidizing the latter with hydrogen peroxide. Triazine derivatives of the formula XRX, where each X is a 2-hydroxy-4-amino-1,3,5-triazinyl residue linked at the 6-position to R, which is a divalent hydrocarbon or substituted hydrocarbon radical, are obtained by heating a dicarboxylic acid with 2 mols. of dicyandiamide. The use of succinic, sebacic and terephthalic acids in this reaction is mentioned. U.S.A. Specification 2,431,644 is referred to. The products are intended for use in detergent compositions (see Group III).ALSO:To reduce the tendency of aqueous detergent solutions to tarnish certain metals and alloys, e.g. German silver, there is included in the detergent compositions (1) a 2-hydroxy-4-amino-1,3,5-triazine substituted in the 6-position with a hydrocarbon group of 1-25 carbon atoms; or (2) a compound of the formula XRX, where each X is a 2-hydroxy-4-amino-1,3,5-triazinyl residue linked at the 6-position to R, which is a divalent hydrocarbon group of 1-25 carbon atoms; the hydrocarbon group in each case may be substituted. These additives are obtainable by heating a mono- or di-carboxylic acid with dicyandiamide (see Group IV (b)), and the crude product of this reaction may be used as such, without isolating the additives therefrom. Specified carboxylic acids from which suitable additives are so obtainable include acetic, caprylic, lauric, stearic, oleic, benzoic, succinic, sebacic and terephthalic acids, the acids derived from palm oil, monochlorinated acids from palm-kernel oil, and tall oil or rosin. The proportion of additive may be 0.05-10 per cent, preferably 0.5-2.5 per cent, based on the detergent. The detergent compositions may have a basis of condensed phosphates, e.g. of sodium or potassium tripolyphosphate, pyrophosphate or hexametaphosphate, or they may contain a non-ionic detergent, e.g. a condensation product of an alkylphenol with ethylene oxide, or a sulphated or sulphonated detergent, e.g. an alkylaryl sulphonate such as a dodecylbenzene sulphonate, or an alkyl sulphate such as sodium lauryl sulphate, or a substituted alkyl sulphonate such as a fatty acid ester of N-hydroxyethyl sulphoacetamide. The compositions may also contain alkali-metal sulphates, chlorides, silicates, borates, carbonates and meta- and ortho-phosphates, magnesium chloride, salts of carboxymethyl cellulose, fluorescent whitening agents and perfumes; peroxy compounds, e.g. sodium perborate, are preferably not included. Specific compositions are described, and comparative experimental results are given. U.S.A. Specification 2,431,644 is referred to.ALSO:To reduce the tendency of aqueous detergent solutions to tarnish certain metals and alloys, e.g. German silver, there is included in the detergent compositions (1) a 2-hydroxy-4-amino-1,3,5-triazine substituted in the 6-position with a hydrocarbon group of 1-25 carbon atoms; or (2) a compound of the formula XRX, where each X is a 2-hydroxy-4-amino-1,3,5-triazinyl residue linked at the 6-position to R, which is a divalent hydrocarbon group of 1-25 carbon atoms; the hydrocarbon group in each case may be substituted. These additives are obtainable by heating a mono- or di-carboxylic acid with dicyandiamide (see Group IV (b)), and the crude product of this reaction may be used as such, without isolating the additives therefrom. Specified carboxylic acids from which suitable additives are so obtainable include acetic, caprylic, lauric, stearic, oleic, benzoic, succinic, sebacic and terephthalic acids, the acids derived from palm oil, monochlorinated acids from palm-kernel oil, and tall oil or rosin. The proportion of additive may be 0.05-10 per cent, preferably 0.5-2.5 per cent, based on the detergent. The detergent compositions may have a basis of condensed phosphates, e.g. of sodium or potassium tripolyphosphate, pyrophosphate or hexametaphosphate, or they may contain a nonionic detergent, e.g. a condensation product of an alkylphenol with ethylene oxide, or a sulphated or sulphonated detergent, e.g. an alkylaryl sulphonate such as a dodecylbenzene sulphonate, or an alkyl sulphate such as sodium lauryl sulphate, or a substituted alkyl sulphonate such as a fatty acid ester of N-hydroxyethyl sulphoacetamide. The compositions may also contain alkali-metal sulphates, chlorides, silicates, borates, carbonates and meta- and ortho-phosphates, magnesium chloride, salts of carboxymethyl cellulose, fluorescent whitening agents and perfumes; peroxy compounds, e.g. sodium perborate, are preferably not included. Specific compositions are described, and comparative experimental results are given. U.S.A. Specification 2,431,644 is referred to.