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Posted by Darryl Gomes on August 14, 19102 at 20:15:35:

In Reply to: Re: White Acid posted by Steve Carter on August 14, 19102 at 18:24:13:

Thank you Steve.. This is a great help.

I have also been doing a little research and found that ammonium bifluoride disilved in water can do the same thing, although I have not found any recipes for the ratio of water to ammonium bifluoride. I have also learned that ammonium bifluoride is a fair bit safer to use than the hydrofluoric acid/soda mixture.

I think I will probably screen 2 coats of asphaltum resist for clearing the pattern with hydrofluoric acid.

Darryl Gomes

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