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

previous by date index next by date
previous in topic topic list next in topic

Subject: Re: Newbie questions

From: "Andrew" <andrewm1973@...>
Date: 2007-04-12

> Adam wrote:
>
> Positive resists use a much stronger
> alkaline developer, like 1% NaOH or
> Na2SO3. Negative dryfilm resist require
> a much gentler alkaline like 1% Na2CO3.
> I gave up on positive resists years
> ago, but been told silicate is much
> easer to use than the hydroxide.

OK - so the stuff I buy from them is
just Na2CO3. Will give some stuff from
the super market a try then.