Re: Some Kallitype observations
I would tend to agree with your comments below. Also, did you notice a difference in Standard Color Density between the two? If you could post the two Standard Color Densities that would be interesting.
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Precision Digital Negatives--The Book
PDNPrint Forum at Yahoo Groups
In a message dated 9/6/06 5:27:04 AM, firstname.lastname@example.org writes:
Another interesting point is that: my usual Ziatype coating solution
exhibit around 27 - 28 steps in the 31-step tablet tests, whereas
kallitype exhibit around 24 - 25. Using the same printer / inks and
media I can get paper white with Ziatype (despite being a longer scale
process) but I can't get paper white Kallitype! Quite confusing. My take
is: Ferric Oxalate is sensitive to more than one wavelenghts. Some
experience with Cyanotype Rex - which use the same sensitizer -
strengthens this impression. (I have fogging problems and quite bizzare
H&D curve results with Cyanotype Rex.)