Note 18 — Chapter VII
S. R. (Sylvester Rosa) Koehler translation
(p. 52.) M. Lalanne, it seems to me, does not do full justice to zinc plates. Very delicate lines can be bitten on zinc if the acid is sufficiently weakened. I have found that one part of nitric acid to eight parts of water, used on zinc, is about equal to one-half acid and one-half water, used on copper for about the same length of time. Zinc plates can also be bought of Mr. Geo. B. Sharp, 45 Gold St., New York. As to the length of edition that can be printed from a zinc plate, see Note [27].