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

>
>
>
>________________________________
>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
>>
>>
>>
>> 
>>
>>
>>------------------------------------
>>
>>Be sure to visit the group home and check for new Links, Files, and Photos:
>>http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>>
>>
>>
>
>
> 
>
>
>      
>
>[Non-text portions of this message have been removed]
>
>
>
>------------------------------------
>
>Be sure to visit the group home and check for new Links, Files, and Photos:
>http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>