Dipping plates into the acid bath (a nasty dangerous job) the plates have had a pattern print put on, the rest of the plate blanked out, so the acid only bites into the pattern, which is then gilded, giving the effect of hand gilding.
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Dipping plates into the acid bath (a nasty dangerous job) the plates have had a pattern print put on, the rest of the plate blanked out, so the acid only bites into the pattern, which is then gilded, giving the effect of hand gilding.