There are both types available, one ready mixed, [would imagine a shelf life of a couple of years] and a two part product, with a sensitizer, [that probably has a much longer shelf life] if i recall correctly, there are spirit based emulsions and water based emulsions, once exposed both are pretty tough. I also note Diazo make a product for very fine detail prints. As mentioned previously i will give it a go and report my findings.
David
--- In Homebrew_PCBs@yahoogroups.com, "Jeff Heiss" <jeff.heiss@...> wrote:
>
> What is the shelf life of silkscreen emulsion? Do you have to mix the
> emulsion with a sensitizer?
>
>
>
> Jeff
>
>
>
> _____
>
> From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
> On Behalf Of Roland F. Harriston
> Sent: Sunday, April 15, 2012 11:59 AM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: Re: [Homebrew_PCBs] Re: Alternative photoresist chemicals - Idea?
>
>
>
>
>
> Ulano was the company that made the stuff I purchased many years ago.
> I think they also made a material called "Rubylith".
> Old-time microstripline designers will remember this material.
>
> As I recall, most silk screen inks were spirit-based, and the screen image
> was not affected by the paint.
>
> So, I'm thinking that the emulsion would most likely be immune to
> most pc board etchants.
>
> Someone should really get into this idea and see how it works.
>
> Roland F. Harriston, P.D.
> ∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗
>
> Randall Morgan wrote:
> > Silk Screen Emulsion Source:
> >
> http://www.silkscreeningsupplies.com/diazo-photo-emulsion?gclid=CNDprfSXt68C
> FYYHRQodu2zWjQ
> >
> >
> > I have no idea if it works but would be interesting to find out.
> >
> >
> >
> > On Sun, Apr 15, 2012 at 8:27 AM, Roland F. Harriston <rolohar@...
> <mailto:rolohar%40comcast.net> >wrote:
> >
> >
> >> ∗∗
> >>
> >>
> >>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>