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Subject: Acid etch time

From: "txtom2" <unknown2@...>
Date: 2012-07-09

I just mixed up some Muriatic Acid and Hydrogen Peroxide (1:2) and tried etching a very small piece of PC board (cleaned and with no mask)to see how long it takes to etch thru (room temp about 75 degrees F). I saw a change in surface color in a couple of minutes, but no etch thru after 15 minutes. I changed the ratio to 2:2 to increase the acid content and after 15 minutes, no further apparent progress.

Can someone please tell me what I'm doing wrong ? About how long should it take to etch ??

Thanks, Tom