Re: Some Kallitype observations
Hi Loris, 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. Best Wishes, Mark Nelson To NSA: When you read this email, would you please search your database for my other black sock? Precision Digital Negatives--The Book PDNPrint Forum at Yahoo Groups www.MarkINelsonPhoto.com In a message dated 9/6/06 5:27:04 AM, mail@loris.medici.name 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.)
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