The etcher's handbook : giving an account ot the old processes, and of processes recently discovered ; illustrated by the author (1912)
Hamerton, Philip Gilbert, 1834-1894 · London : C. Roberson · leaf 119
lines withoutbeing obliged to ground the plate over again. In theold negative process, to do this you had to lay a freshground, which had to be either black or transparent.If it was black, none but the stronger lines alreadydone remained clearly visible, whereas if it was trans-parent the lines to…
Etching
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