> George,
>
> I have some serious doubts about how well Van Dyke sensitizer will
> last once it is mixed. Lets see if anyone else on the list has had
> any experience with this. Judy has had some luck keeping sensitized
> cyanotype paper so maybe she has the answer to this.
>
> Bob Schramm
It's been a rough week around here, I mean other than the civilizing
influence of Klaus, definitely a stretch. Which is to say, my reserves of
self-control have been so depleted that I cannot refrain from remarking
that *your* cyanotype formula does not keep more than a few weeks, mine
does.
That's the liquid. Since the emulsion is so easy to apply, I see no
particular reason for coating paper far in advance. Nevertheless, coated
paper (my formula, haven't tested yours) may keep well or fairly well for
more than a week depending on the paper, climate, and storage conditions.
As for the VDB -- I don't know what the formula in question is, thus can
only repeat that I keep the emulsion in an 8-oz brown glass dropper bottle
at room temperature *mixed* without a problem for from one to two
years.....
cheers,
Judy