ok i will do the ethanol test.
but does nobody know why it gets in this jelly stage when mixing it with floor polish?
i had it only in the glass jar, perhaps 10 or 20 ml of floor polish and only very few kali.
after shaking everything was ok (and colored). then putting it down on the desk, lid on, and writing
email (several minutes). after that i took it again and it was in that jelly stage. it still is this
viscosity today.
regards
stefan
17.05.2003 00:34:27, Larry Battraw <
battraw@...> wrote:
>On Fri, 2003-05-16 at 12:55, grantfair2001 wrote:
><snip>
>>
>> By the way, ammonia does react with copper, according to my AMEX, "Do
>> not use with copper or aluminum". I imagine brief contact with dilute
>> solutions ∗might∗ be ok but I would check with a chemist first to see
>> what risks if any, exist for human health.
>>
> Using off-the-shelf generic ammonia works wonderfully for stripping
>boards coated with dry-film resist. However, as you mentioned it does
>react with copper, although rather slowly. I've never noticed any
>problems with corrosion/discoloration until yesterday when I left a
>couple boards in it for over an hour. At that point it had turned the
>copper blueish gray in places and it was not fun having to scrub it
>off. Dry-film resist that has been "baked" too long (to fixate the
>developed film) or been overexposed a lot takes a while to strip using
>concentrated developer solution; ammonia will strip it in inside a
>minute's time.
>
>Larry
>
>
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