CS240850B1 - The way of coloring parchments - Google Patents

Abstract

The purpose of the solution is to achieve a perfect appearance with the old parchment patina, but it is malleable and easy to process when refurbishing old facsimile bindings and art book bindings. This purpose is achieved by treating the parchment shingle with a filler composition comprising, in particular, a linseed brew, of 1.5 to 5.0 weight percent, based on the wrinkled embossed stick.

Description

The present invention relates to a process for coloring parchments made of tinned and ground gelatin, then treated with a filling composition comprising flaxseed decoction, esterified rendered fat, glycerin, chalk, denatured alcohol and water.

As is known, parchment of animal skin is dried from a low temperature, which has been used as a pad for writing and for technical purposes, such as bookbinding. It is produced mainly from sheep, goats and lambs, less often from donkeys, tel-etin »or adobe. Already in historical times, parchments were produced mainly by raw skin soaked and leached for a long time in lime liquor, whereupon their reverse was worked on a block of scythes. After the following thorough washing in water, the clearing was pickled in chicken droppings. Then the reverse side and cheeks were cleaned again, the ground was stretched on the wooden frame and the chalk and bleaching mixture was rubbed into the reverse side and cheeks. The face and back were sanded with pumice stone. It was a very laborious and long-term matter that nobody can devote to the modern era in terms of time.

However, since modern times require a certain amount of this material, the production of parchment for binding purposes and the restoration of old historical ties and foliants was developed in later years. In this production, dewatering of the raw soil was achieved by dipping in acetone baths. (Teyssler - Kotyška: Technical Vocabulary, X, p. 42, Borský a šulc Praha, 1934J

- * “240 8S0

Rejman, L .: Dictionary of Foreign Words, SPN Praha, 1966, p. 281).

Some of the later, somewhat modernized production methods use formaldehyde tanning of the feedstock (CS 229.876) or the combined action of mixtures of ammonium sulfate and sodium chloride with potassium aluminum sulfate (BG 30 858). The attainment of a yellowed or browned state, which is typical of a patina of parchment several centuries old, is usually achieved by adding some coloring agents to the filling mixture, for example by adding a gray aniline dye.

However, the resulting effect is not perfectly satisfactory to obtain the true hue and appearance of an old parchment for writing and binding purposes.

Therefore, a method for color adjustments parchment produced from začiněné and gletované clearings _in then treated plnieí mixture containing a decoction linseed esterified rendered fat, glycerine, chalk, denatured alcohol, and water, the essence of the invention lies in the fact that, together with The feed mixture is treated with canned bovine blood in an amount of 1.5 to 3.0 percent by weight, based on the worn out debris.

The process according to the invention produces parchment which has a perfect appearance with a patina of old parchment, is malleable and easy to process. It is suitable for the renovation of old parchment and facsimiles and for artistic bookbinding.

The method according to the invention uses preserved beef blood in an amount of 1.5 to 3.0 percent by weight per wounded cleared wort for coloring the wort. The blood is added together with a filling mixture that contains flaxseed decoction, esterified rendered fat, glycerin, chalk, denatured alcohol and water. The further process is the same as the parchment-making processes used hitherto.

An example of calf pieces is soaked and sieved, then peeled off, leached in a lime solution and re-saponified. The weighed clearing thus prepared weighs 60 kg. In the course of the process, the ground is decalcified and pickled in a solution of pancreatic enzyme to a pH of 8. It is followed by gelling on a tanner block with a blunt scythe to remove pigmentation and fat from the face of the clearing. which contains 3 240 850 da and 420 g of formaldehyde. In this barrel, the clearing spins for 2 and a half hours, during which time all formaldehyde is removed from the bath.

After tanning, the ground is thrown out of the goat barrel, left to stand for 16 hours, washed, squeezed and filled with a mixture containing denatured alcohol, float chalk, glycerin, esterified rendering oil and water, a solution of boiled flax seed and 2 1% by weight of preserved bovine blood. The total amount of filler mixture is 28.6% by weight, based on the squeezed weight of the starting material. Filling is carried out in a tanner drum for 1 hour.

The filled parchment is then stretched onto wooden frames and left on it until dry. After drying, the individual pieces of parchment are trimmed, sanded on both sides on a tanner, brushed and ironed at 50 ° C at 20 kPa. This results in a patina of the resulting parchment, as if it were a parchment several centuries old.

Claims (1)

SUBJECT OF THE INVENTION Process for coloring parchments made from tinned and grated hiina, then treated with a filling mixture comprising flaxseed decoction, esterified rendered fat, glycerin, chalk, denatured alcohol and water, characterized in that together with the filling mixture, the ground is treated with preserved beef blood %, in an amount of 1.5 to 3.0% w / w, based on the worn out debris.