Individual deacidification
Materials for which deacidification is undesirable can be treated and deacidified in an aqueous solution in an individual manner. When the pages are badly damaged, oversized and sealed documents. Materials unsuitable for the aqueous process can also be processed by other methods and means without water.
- Two-step processing First, the colors and ink are fixed in two-component suspensions so that they do not dissolve after being immersed in an aqueous solution. In this way, the documents are placed in a bath of fixing solution and they move gently in the bath. The document remains in the solution for approximately 2 minutes. Carefully remove the documents from the solution in a horizontal position and drain the excess liquid. Caution - red shades may fade a little. Then submerge in the deacidification liquid. Mg (HCO3) 2 is used here to neutralize acid products and create an alkaline reserve. A 0.2 M solution is used, which is further mixed with a solution based on cellulose ethers. The rest of this solution can be reused if fed into the CO2 solution. The processing procedure in this tub is as follows: the documents are placed in the tub and again carefully moved in the tub. If the documents have not been dried after fixing, they should remain in this solution for about 10 minutes to achieve the desired effect. Documents should also be removed from the tub in a horizontal position. Finally, the documents, compressed between two layers of polypropylene film, are spread over heated cylinders and dried.
– in this case, one-step processing is used. This is a liquid used for mass deacidification in the BCP method. The document is placed in a bath of this solution and left for about 10 minutes. After removing the document, the remaining liquid is pressed and dried again
