Was using the ferric chloride stuff in my basement workshop a year ago. =

The liberated chlorine gas latched onto a bunch of steel cutting tool, =

and created rust in very short time. This a a moderately ventilated area =

with an exhaust fan. Lesson: Use in well ventilated area away from any =

steel, and some other materials.

Forrest Christian wrote:
> Alexandre Guimar=E3es wrote:
>   =

>> 	Ok... One almost not nasty chemical :-) Ferric Chloride. =

>>   =

>>     =

> I'm a fan of Ammonium Persulphate myself...   dry Ferric Chloride is =

> scary stuff, Ammonium Persulphate seems a bit less agressive when you =

> have to mix it from dry.  Plus, I really don't like the brown stains =

> which Ferric Chloride causes and since it is clear (at least until it =

> eats enough copper to turn a nice shade of green if i remember =

> correctly), you can tell a lot easier the status of your board.
>
> You definately do *not* want dry Ferric Chloride to mix it yourself....  =

> did I mention that already?
>   =

>> 	Another insteresting aspect here.... I use a small quantity and
>> "rub" the board with a sponge ! It takes etching timing down to less tha=
n 2
>> minutes ! It is better explained in this link:
>> http://www.pulsarprofx.com/PCB/a_Pages/5_Support/5b_Tips_Tricks/Tips_Tri=
cks.
>> html#Anchor-49575
>>   =

>>     =

> That is very interesting...  Too bad it only works with Ferric =

> Chloride...  Still, I might give it a try.
>
> -forrest
>   =

-- =

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