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Homebrew PCBs

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Message

Re: black photoresist masters - darkening

2005-07-25 by derekhawkins

> I'll see if I can get some Xylol.

Homedepot sells it if you live in the US. If not, it is also called 
xylene or dimethyl benzene.

> What's the procedure for vaporizing then?

Pour to about a 1/2" level in a container with mouth larger than the 
area covered by the artwork. A plastic container (like a sandwich box) 
can be used provided it's not also used for storing the xylol. Place 
the transparency with artwork facing down over the mouth of the 
container. Place a piece of thick cardboard with some form of weight 
over the transparency. Check after 15 to 30 minutes. Careful, wait too 
long and the toner may get so wet that it starts to run. Store the used 
xylol in a sealed metal or glass container for reuse when done.



--- In Homebrew_PCBs@yahoogroups.com, "hjf2k2" <drgenio@h...> wrote:
> I'll see if I can get some Xylol. What's the procedure for vaporizing
> then?
> 
> > Vellum lets the light through too. In other words the fogging 
negates 
> > the gains from using transparencies in the first place. You can get 
the 
> > darkened print without the fogging using xylol vapor.

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