in the chrome plate making, the chrome plate which was coated with the photoresist not only has the characteristic of positive but also that of negative.
在制造铬板时,用这种胶涂敷的铬板既可当正胶板用也可作负胶板用,即得到「正负两型」铬板。
any visible evidence of chrome plate distress can indicate the likelihood of base metal heat damage.