Pencils
Special-purpose
pencils
Special-purpose pencils are those pencils that are nonreproducing or have
waxed based cores. Use a nonreproducible blue pencil for layout work
intended for black-and-white reproduction. Most black-and-white
photographic films are blind to the light sky-blue color and will not record it
on the negative. Nonreproducing lithographic pencils are dark violet in
color. Used on a lithographic plate, this pencil will not appear in the finished
product. Waxed-based leaded pencils, sometimes called china markers, come
in a variety of colors and are capable of marking on glass, plastic, and metal
surfaces.
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