[alt-photo] Re: 3 color gum and PDN calibration?

[Loris Medici]

Johnny, I kinda agree with the comment below.

Just for the records / for the case you may feel the need for an
alternative method in the future:

- Calibrate for a much more simpler / stable (in terms of consistency,
number of parameters and ease of calibration) process such as
cyanotype, p/pd and such (shorter scale processes are better, since
gum also has a relatively short scale)
- Find the correct pigment-dichromate ratio, exposure time and
development regime to suit the negative for each separations. I mean:
Don't confine yourself into a strict set of parameters, use the
flexibility of gum! It would be a good exercise in exploring /
learning the capabilities of the gum process too!

Hope this helps somehow,
Regards,
Loris.

2012/9/27 Mary <gneissgirl at spamcop.net>:
> ...
> I have to admit that after struggling with PDN for calibrating gum, I kind
> of gave up. I just didn't have the patience to deal with it. I remember
> yellow being particularly frustrating. I admire your tenacity!