Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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direct dyes

A class of ANILINE DYES , 50 called because they have such great affinity for cellulose fibers, i.e., paper and some cloths. While both these andACID DYES are sodium salts of dye acids, direct dyes do not require the use of a MORDANT .

Their shades are duller than those of either acid or BASIC DYES and they tend to have less tinctorial value than the basic dyes; however, they have the very important advantages of being much more lightfast than the basic dyes, and in certain instances, more so than even the acid dyes. (17 )

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