Homebrew PCBs

If you want to experiment with different strenghts of Hydrogen Peroxide, here's a list of where to find Hydrochloric Acid and Hydrogen Peroxide in US stores.

Available at Hardware, Building Supply, and Pool Supply stores
Hydrochloric Acid / Muriatic Acid 31%

Available at Grocery stores, Pharmacies
3% Hydrogen Peroxide

Available at Beauty Supply stores
Developer 10 volume or V10 = 3% Hydrogen Peroxide
Developer 20 volume or V20 = 6% Hydrogen Peroxide
Developer 30 volume or V30 = 9% Hydrogen Peroxide
Developer 40 volume or V40 = 12% Hydrogen Peroxide

Available at Pool / Spa supply stores
Baquacil Oxidizer = 27% Hydrogen Peroxide

--- In Homebrew_PCBs@yahoogroups.com, "txtom2" <unknown2@...> wrote:
>
> 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
>