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17. The d e p e n d e n c e of e n z y m e activity o n solvent centration at 3 7 ° C . 27 Scientific Developments derived from experiments done at 25°C; data for the other solvents deriving from reactions at 37°C. The form of all four curves would be expected to resemble that for 2 methoxyethanol if larger ranges of concentration had been investigated for all solvents. The enzyme activity for a given organic solvent is seen to be proportional to the water concentration in the resultant reaction mixture, within the useful range of solvent mixtures (30-60% solvent).

The alterations range from a little bleeding of the colour through a nearly complete smearing of the letters writing to entire dis­ appearance. Many stamp inks, reprint inks and coloured pencils reacted in like manner. Some of them dissolved in liquid ammonia, with others the colour was dissolved by the water needed for the glazing. As far as archives are concerned, these results mean a limitation in the range of applications of the technique. In the conservation treatment of modern records it would be necessary to first fix the soluble dyestuffs.

9 was stored in a cool place and not used. It may well be that the restorers testing them gave a lower grade because of their wood content and yellowness. This colouring exists on outer parts of the leaves, whereas for the mechanical tests the inner parts were used. All the other papers are within ±_ one class in both systems of classification. It is therefore recommended that this classification be use used in the context of weak and aged papers in archives and libraries. Krause and Koura have stated, in their paper to this conference, that the treatment of papers with highly concentrated ammonia-solutions increases the stability of papers.

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