Glossary, Continued
X
XEROGRAPHY— A copying process that uses electrostatic forces to form
an image.
Z
ZINC WHITE— A zinc oxide based pigment that is less opaque than titanium
and lead white.
ZIP-A-TONE— A transparent acetate sheet preprinted with patterns of dots
or lines that create tone.
ZONE NUMBERS— Numbers and letters on the border of a drawing to
provide reference points to aid in locating specific points in the drawing.
ZOOM LENS— A variable focal-length lens that functions as a telephoto lens
but allows you to select the range of the object magnification.
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