( n. )
A gummy composition spread over the surface of a metal to be etched, to prevent the acid from eating except where an opening is made by the needle.
( n. )
A gummy composition spread over the surface of a metal to be etched, to prevent the acid from eating except where an opening is made by the needle.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012