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

----- Original Message -----
From: "Stefan Trethan" <stefan_trethan@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Tuesday, January 03, 2006 4:17 PM
Subject: Re: [Homebrew_PCBs] CUCL Temperature , etch time ?????


> On Tue, 03 Jan 2006 16:24:52 +0100, Leon Heller
> <leon.heller@...> wrote:
>
>> It should be blue for proper etching. You need to add some concentrated
>>
>> H2O2, to oxidise the green cuprous chloride to cupric chloride. Adding
>> the
>>
>> 3% H2O2 will make the solution too dilute. Or, just mix it fresh each
>> time.
>>
>>
>> Leon
>
>
> NO, not BLUE! It should be green. If it is blue you have no HCl and it
> can't etch.

You are right, of course. I just checked some of mine and it is green.

Leon