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| China Clay | Asbestine | Gypsum |
Panel No. 33—Asbestine. In the same condition as Panel No. 32.
Excellent Surface shown by American Vermilion after nearly Four Years’ Exposure
Panel No. 34—American Vermilion. This pigment has given perfect protection to the plates. The film is strong and elastic, and upon removal reveals the bright steel. No chalking, checking, discoloration, or other signs of paint failure are shown. It would appear that the inhibitive characteristics of this pigment are pronounced, and it promises to give efficient service for several years more.
Panel No. 36—Lead Chromate. This panel is in generally fair condition, but slight checking is shown.
Perfect Condition of Plate Painted with Zinc Chromate; One Half Stripped. (Negative cracked)