PCB MAKING AND CHEMICAL ETCHING PROCESS - Practice Mode

1) Which solution is used for treatment after colouring?
Correct Answer: Nickel acid and Boric acid
2) Which is the cause if the article surface on dark stain during dyeing?
Correct Answer: Dyestuff not soluble
3) Which process is used to colour film removal?
Correct Answer: Bleaching
4) Which is the application of conversion coating?
Correct Answer: Electronic industry
5) Which solution is used for conversion coating?
Correct Answer: Chromic acid
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