> >The majority of pigments work fine with carbon printing, but some
> >cause staining and fog, others will not disperse well in the gelatin
> >solution, while others destroy the bond that holds the pigmented
> >gelatin image on the final carrier.
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> Never heard tell of that one. Do you remember the culprit's name?
>
Yes, I do remember the offending pigment. It was a Dalamar Yellow HSD,
Type YW-911-P of Dupont. Back in the early 1980s, perhpas in late
1981, Richard Kauffman recommended a set of three-color pigments for
carbro work, very similar to the set you mentions in your History and
Practice of Carbon Processes. The yellow of the set was Dalamare powder,
then Dupont's YT 858D. Kauffman told me that the liquid dispersion
Dalamare had not worked for him, but the hassle of having to mix
the powderded pigment made me try anyway. It worked perfectly, except
when I tried to develop the yellow relief on the plastic it simply
washed off. The liquid dispersion was Dupont's YW-911-P, a 53% solid
dispersion in water/ethylene glycol containing nonionic/aniionic
surfactant blends. Perhaps you or somebody else out there would
recognize why a pigmented gelatin relief would not adhere to the
plastic during warm water development.
I weigh to .1g the amount of
> >pigment per 1000ml of solution, and keep good ntoes. If it works,
> >great, otherwise chalk it up to experience and move on.
> >
> >As for dispersions, nothing special. I use 35g of sugar per 1000ml of
> >gelatin solution, and 10-15ml of glycerine. I first grind everything
> >up very carefully with a pestle and mortar, then mix in a blender at
>
> you mean everything minus the gelatin I presume?
>
That is correct.
>
> Just make very sure that the blade set is never used for food again. I have
> never been able to clean them thoroughly
>
Right again. This is a dedicated carbon tissue blender. No margaritas
out of there.
>
>
Sandy King