Homebrew PCBs

wow!

You dudes play around with some very nasty stuff just to etch a printed 
circuit!

Or, maybe this thread is just a sort of "pissing contest" to show off that
the participants have had Chem 101 at a community college.

Pardon my  cynicism, but I just don't get the drift.

Keep it simple..........keep it safe.

Roland F. Harriston, P.D.
***************************

On 3/15/2013 4:16 PM, smilingcat90254 wrote:
>
> Calcium carbonate for that matter most carbonate will react with even 
> trace amount of hydrochloric acid remaining in your etchant. And yes 
> it will foam because CO2 is being released in the reaction. So if your 
> solution keeps foaming keep adding the carbonate. It will neutralize 
> the acid for safe disposal.
>
> Reaction of Copper chloride and Calcium carbonate probably will be 
> much slower than Copper chloride and sodium carbonate. But it should 
> work. not 100% plus sure.
>
> **** HF acid ****
> I was in semiconductor manufacturing business so I'm quite aware of HF 
> acid. Very dangerous stuff. No you can not store in a glass. It will 
> etch glass. No you can not store in stainless steel container!!
>
> HF chemical burn is severe even at low concentration. It will 
> penetrate bare skin and the flourine ion will interact with the 
> calcium in your bone. HF will dissolve your bone under all the tissue.
>
> I didn't think you can buy it unless you can show you are a business 
> or a researcher of some sort.
>
> 



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