mottling
1. The process of decorating the covers of a book
by applying color or acid to the leather. See, for
example, MOTTLED
CALF . See also: TREE CALF . 2. In
printing, a defect appearing: 1) on a solid print
as a variation in color intensity across the sheet
or as a variation in gloss; or 2) as a blotchiness
due to frothmarking. Mottling may be caused by
localized variations in either ink receptivity or
penetration; in the former it may be predominantly
a difference in hue, while in the latter it will
generally be a result of a difference in gloss. 3.
The uneven dyeing of paper pulp fibers resulting
from the coloring of a small number of fibers
before complete dispersion of the dye. This is due
to the manner of addition of a hot concentrated
solution of dyestuff to the beater, or of dyeing a
combination furnish containing fibers which take
up the dye more readily than others. 4. An uneven
dyeing of a paper due to the application of drops
of dye on the web while it is on the Fourdrinier
wire or on the finished sheet after it has left
the papermaking machine. (17 , 93 , 159 , 172 )
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