Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, KeepIt SimpleStupid
<keepitsimplestupid@...> wrote:
>
> 
> --- Frank <frank@...> wrote:
> 
> > Firstly, the blacks aren't very black, they're all
> > splotchy.  I 
> > wanted to use GCC Toner Density Spray, but according

> You don't want to print on transparency film.  Try to
> find some polyester paper.  It will do wonders for
> printing.  It's translucent, but not transparent, but
> will expose with UV.

Tshirt makers, when they print and expose their photosensitive
screens, use "vellum" as you describe, not transparencies. Either with
laser printers, or with inkjet printers.

Here is a good board on screenprinting and such where you may find
more info on these "vellums". I put that in quotes because real vellum
was something like the inside layer of animal hide, modern vellum is
cotton or polyester.

http://boards.screenprinters.net/

What looks the clearest is not always the best. I'm in EET training
right now and have to make blueprints. I bought some fancy very clear
vellum for drafting (pencil) and it -looks- like it would work better
than the stock 100% cotton vellum they wanted us to buy. Their vellum
is whiter and appears more opaque than what I bought. But the pencil
lines are a lot darker on their vellum, so their vellum works better
for blueprints.

Steve Greenfield