Homebrew PCBs

On Tue, 01 Aug 2006 00:06:19 +0200, Herbert E. Plett <cachureos@...>  
wrote:

> Stefan:
> what are those black spots on your etched boards?

What black spots?
You mean the blackened areas of copper? That's what the problem is - the  
resist giving out halfway through and allowing the copper to be etched  
partway.
If that's what you meant...

> re picture labelled 'acetone': I would never even try to use a board as  
> dirty
> as this looks for toner transfer. (does not look like photograph  
> artifacts).
> it is definitely not going to work out ok...

I dunno, looks pretty clean to me! I use the same cleaning (even less  
careful) for TT with no problems.
there isn't really much i can do other than abrade the surface and then  
remove the dust and remaining grease...

ST