Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

On Mon, 21 Feb 2011 18:20:02 -0800 (PST), you wrote:

>I mix the acid into the peroxide? Not the other way around?
>and do I have to mix slowly? is there heat generation or splattering?
>from the mixing process ?
>

ALWAYS add acid to water. Heat will be generated, but splattering
will be minimized that way. Mix slowly. Check general chemistry lab
rules.

Harvey

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>________________________________
>From: Harvey White <madyn@...>
>To: Homebrew_PCBs@yahoogroups.com
>Sent: Mon, February 21, 2011 8:43:46 PM
>Subject: Re: [Homebrew_PCBs] FR-4 Copper Clad and Etchant mix
>
>
>On Mon, 21 Feb 2011 17:29:51 -0800 (PST), you wrote:
>
>>FR-4 doesnt have to be green colored? Correct ?
>
>I've used black, good for displays, blocks light.
>>
>>Other question .. for making etchant ..
>>I saw 2 parts peroxide to one part muriatic acid ( 34% hydrochloric acid )
>>and I saw 3 to mix as well ..
>>Is it crucial ? I mean I guess the only thing that it would change is the
>>etching
>>times .. and the fumes LOL .. ??
>
>I've used 4 parts peroxide to 1 part acid. Don't think it's
>absolutely critical.
>
>Harvey
>
>>
>>Randy
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>>------------------------------------
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>>Be sure to visit the group home and check for new Links, Files, and Photos:
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>>
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>------------------------------------
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>Be sure to visit the group home and check for new Links, Files, and Photos:
>http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
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