Alt-BEAM Archive
Message #06762
To: beam@sgiblab.sgi.com beam@sgiblab.sgi.com
From: James Wilson jameswilson11@home.com
Date: Saturday, 16 October 1999 12:23
Subject: Re: PCB etching
>Does amonium persulphate freeze at normal frezer temps?
>
>The reason I ask is because I usually use ferric chloride for etching
mainly
>bc it's cheap and I can get it in a relatively inert form - solid. When I
>etch a board it is usually very small and like to save the solution. I
have
>tried freezing it but it will not become solid in my freezer, or out doors
>Canadian eh!
>
>James :-))
>----- Original Message -----
>From: Richard Weait
>To:
>Sent: Friday, October 15, 1999 8:19 PM
>Subject: Re: PCB etching
>
>
>> At 10:31 PM 10/15/99 +0000, you wrote:
>>
>> >Does anybody recommend Radio Shack PCB kits?
>>
>> . . . is that silence that I hear? . . .
>>
>> Use ammonium persulphate for etching, rather than ferric chloride.
>> The crystals are easier to store, you can 'see' the reaction, and
>> judge when it is complete.
>>
>> Read the label and follow the safety instructions.
>>
>> Cheers,
>>
>> Richard.
>
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