Russell Shaw wrote:
> Leon wrote:
>> ----- Original Message -----
>> From: "jusdebra" <pookie_debra@...>
>> To: <Homebrew_PCBs@yahoogroups.com>
>> Sent: Wednesday, April 11, 2007 9:17 PM
>> Subject: Re: [Homebrew_PCBs] Re: Newbie questions
>>
>>
>>> OMG, my dad is a Dave Miller. Almost freaked me out when I saw it. I was
>>> thinking, "Is he in this group?"
>>>
>>> Anyway, you guys have me confused again. Some recommend acid and some
>>> alkali. I've worked with both in some very strong concentrations and know
>>> how to handle them. I have a $300 respirator with O2 feed and lots of
>>> gloves. My biggest question is the type of paper you use in the printer
>>> so you can get a transfer. Where do you get it? Also a good source for
>>> blank boards (single side to start with). What about software? Is there
>>> a freeware that works good for simple layouts? Is there a standard
>>> commercial package that everyone uses or is the most popular. I've read
>>> about Eagle????
>>> I've done some layouts by hand with a felt tip pen, but it's time
>>> consuming and difficult to edit.
>> We were discussing the photo etch process, not toner transfer. NaOH solution
>> is for developing the resist after UV exposure.
>
> I use 10% Na2CO3 sodium carbonate for the developing. Unlike NaOH,
> it's much less reactive to skin.
Correction: It was 1% Na2CO3 sodium carbonate i use for negative resist.