Excerpt from Illustrations in Publications of the Fish and Wildlife Service
Only line drawings made with the best materials repro duce well. Always use a waterproof India ink with a good black color and a good quality tracing cloth, tracing paper, white paper, or acetate. Ext... reme care must be taken when acetate is used. It is especially susceptible to finger prints and is easily charged with static electricity that attracts lint and dirt particles to the illustration.
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