Homebrew PCBs

Stefan Trethan wrote:
> What i wanted to ask before the huge picture file diverted me:
> 
> You wrote you used aceton for rubbing off the toner.
> In the blackened areas, did the acetone solve the epoxy and mix it with 
> toner?
> or what else?
> that looks not good and it would be a reason not to use acetone for 
> rubbing.
> I use laquer thinner and had no such effects.
> 
   Why do you jump to this from a little bit of black left on the board? 
  You're likely using several times too much solvent if you're getting 
your board spotless.  Or your board composition is different from his so 
is more slick and washes more easily.  Or any of a half dozen other more 
sensible reasons than the acetone is melting the board to any degree 
worth noticing..

   Even if it actually did what you're guessing it wouldn't be a cause 
for concern at all since it evaporates fast and isn't going under the 
traces.  But it's not, it's just drying and leaving the toner residue on 
the board.

 >Please delete the tiff image, the jpeg has no data loss and safes 
LOADS of
space.

   You should note for reference that JPEG is actually a lossy 
compression.  Fine for general pictures like this but for anything you 
really need no degradation it's not the right format.  Magnify a small 
section of the tiff and jpeg and you'll see zones in the jpeg edges, the 
hallmark of different data.  Enlarge a JPEG beyond a certain point set 
by the compression level and it'll look terrible, the compression takes 
out the fine detail beyond a certain point.  Doesn't matter for most 
pictures though.

Alan