Sandy King schrieb:
> I
> have on several occasions worked with aged Hanfstaengl tissue claimed to
> have been kept in frozen storage. Even if so, the B+F was very high, in all
> cases over .30.
I would be interested to hear where and when you got it and what type it
was. The Hanfstaengl papers #19 (violet black) and #20 (olive black)
coated in 1991/1992 still are in good condition. I don't have a fog test
at hand but if sensitized and used carefully they show no visible fog
(certainly less than .30)
Before the late 80s however, Hanfstaengl didn't store their papers in
plastic envelopes (s. th. I recommended to them because I also noticed
fogging with some colours). Esp. the ymc set was a catastrophe because
the magenta pigment hardened the gelatin over time. The remaining rolls
of new ymc material (coated on polyester) however are stored deep frozen
in plastic bags since then. As I am no longer interested in full colour
work, I'd be willing to give these tissues (??) away at a low price.
Anybody interested should contact me offlist.
> I am curious as to what Autotype and Hanfstengl added to their
> gelatin/pigment mixture which led them to believe that it could be stored
> indefinitley. Any comments appreciated.
Hanfstaengl added nothing to it except gelatin, water, aquaous pigment
dispersions and a wetting agent. Sorry, I am not allowed to publish the
exact formulas.
Klaus Pollmeier