Don't use acetone to remove the toner, instead use a steel scraper or
even the edge of another PCB to scrape the toner off mechanically.
Then use acetone to remove any tiny bits that may be left and to clean
the board.
No the scraping will not damage thin traces if you don't scrape with a corner.
Some PCBs seem to be more prone to this clouding thing than others. I
believe they are not all the same epoxy, or maybe some aren't epoxy at
all.
ST
On 10/31/07, bagmik <bagmik@...> wrote:
> Hi everybody,
>
> removing toner from a PCB after etching leaves toner impregnating the
> epoxy, giving "black clouds" on it.
>
> Does anyone of you get the same ?
>
> Has anyone already solved the problem ?
>
> Mike.
>
>