| 摘要 |
1,154,212. Etching. M. BASSAN. 21 June, 1966, No. 27658/66. Heading B6J. [Also in Division G2] A photomechanical process comprises imagewise exposing a material consisting of a glass support coated with a metallic layer and then with a photoresist containing a bichromate and Judean bitumen layer, developing to remove the unexposed areas of the photoresist, etching through the metallic layer and then partly etching the glass support. A different metal or a paint may be deposited on the etched glass support. Specified etchants are nitric or hydrochloric acid for the metallic layer and hydrofluoric acid for the glass support.
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