Re: spots and fish eyes

On 8 Dec 2003, at 13:17, Katharine Thayer wrote:

> If the fish eyes are what I'm picturing, where the emulsion opens up
> holes as it's being brushed on, I'm totally with Jack on the cause:
> the surface is not accepting the emulsion, and in my experience the
> most likely cause for that is that the sizing is too thick or too
> slick. If the sizing fills the tooth of the paper, then there's
> nothing for the emulsion to hang onto. I like Jack's idea of
> Scotch-brite; I've used sandpaper for the same purpose. kt

I'm interested in this topic too as I've experienced quite a bit of this.
Mostly I've had it happen when I'm drawing very thin coats (both
gelatin and gum), and sometimes I've seen it happen in spots
where there were little sparkly places on the gelatin-sized paper.
The sparkles are certainly not in the paper to start with, so I've
wondered if maybe little crystals of gelatin have grown, and maybe
they are more resistant to wetting by the gum. Just speculation.

Anyway, I've heard that a drop of everclear and a drop of
formaldehyde in the _gum_ will fix the problem. I forgot how much
gum should be receiving these drops, so this may not be much
help. I haven't tried it yet -- I can't find formaldehyde anywhere!
Regards,
Gary Nored
http://home.centurytel.net/Gary_Nored/
Received on Mon Dec 8 19:08:56 2003