Re: Litho Film

[Joel Alpers <joel.alpers@xxxxxxxxxxx>]

Paul A. Lehman wrote:
> 
> > >I tried it briefly, and had problems with bubbles in the emulsion.  Haven't
> > >had time to get back to it.  It was cheap enough to experiment with, but
> > >I haven't figured out how to make it work well.
> >
> > Bubbles? I'm not familiar with this happening.

Wasn't she the exotic dancer over at the "Trough and Brew"???

 
> Could these "bubbles" that you are referring to be
> pinholes in the emulsion? This can happen when using a
> stop bath. I was told that the acid causes carbonates
> in the emulsion to convert to CO2 and explode out. I
> skip the acid stop bath and use a water rinse instead
> before fixing when processing sheet film.

I've seen this in APX100 4x5 sheet film, going to a plain
water stop bath cured it. 

Or, if they're nice round spots, they could be air bells...

Joel.