Homebrew PCBs

> It's a spray, cheap, about $7 for the local brand 

Was this "Laser Buddy" by any chance? While it darkens the print, I 
find it "fogs" up the transparency somewhat. A respirator with organic 
vapor cartridges is definitely recommended when spraying that stuff. 
Got better results exposing the transparency to xylol vapor. 

--- In Homebrew_PCBs@yahoogroups.com, "hjf2k2" <drgenio@h...> wrote:
> Hi all, I'm still working on the serigraphy emulsion system. I think I
> need to increase the exposure  time to burn the emulsion a little
> more. The problem is that I'm using transparencies with toner as
> masters, and toner, even from a new cartridge, is not totally black.
> So I went to the serigraphy shop and found a very interesting product:
> toner darkener. It's actually called toner blackener in my language
> (ennegrecedor de toner), but I found it as darkener on google. 
> It's a spray, cheap, about $7 for the local brand and $15 for an
> european brand, which the guy told me is used to make masters for
> offset prints. So I bought that one and sprayed it on a transparency.
> the effect was INSTANT, it dried up in a few seconds and the toner is
> now totally black, even under the sun!
> So to all people using photo resist, this might be an interesting
> option. Also to people who use toner transfer, maybe this will help
> with thin lines? I didn't see if it leaves residue as the test
> transparency I used had no transparent edges.