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

--- In Homebrew_PCBs@yahoogroups.com, "Dave" <wa4qal@y...> wrote:
...
> I think it has to do with the type of board. I've had this problem
> before, too (although it's been a couple of years since I've
> etched any boards). The acetone seems to melt the toner, and then,
> when rubbed, seems to be transported to the board where it soaks in
> and refuses to come out. I've not found that it causes any problems,
> other that discolouring the board and making it look not quite as
> nice.
>
> > For me, acetone is worth the precautions it takes to be safe
> > (ventilation). It takes the toner off in seconds. I also use it for
> > board prep - it degreases the copper perfectly and leaves no residue.
>
> Don't forget that acetone may also be a liver carcinogen. It's not
> nice to breathe it, or to get it on your skin, since it may be
> absorbed through the skin.

I've been thinking about this some more. I use a paper towel with a
little acetone on it to wipe off the toner (or clean the copper). At
most the acetone forms a film on the board for a few seconds and is
then wiped off. The toner comes off very quickly and really doesn't
have much time to stain. This could be the difference. Its quite
efficient and uses very little acetone.

On safety with acetone (applies to most chemicals).
1) use only in a well ventilated area (most important)
2) use chemical resistant gloves
3) use safety glasses
4) use a chemical resistant apron (not strictly necessary for acetone
but I use one anyway).