Saturday, September 29, 2007

Cyanotype over Platinum Report 3: Shrinkage

I mentioned last time that I soaked some paper in water and dried it out. I checked it today and sure enough it's about 4 mm shorter in the 10-inch direction (1.5%), and unchanged in the 8 inch direction (it's not unusual to have it happen one way and not the other, or different amounts). You can imagine that if the two negatives are off by that much that you would get problems. The real question is after making a print, how much more will it shrink? And then if it's enough to care about, which of the several approaches will I take to fix it? We'll just have to see how it goes.

Likewise, I suspect that the soaked paper might take up more fluid and I'll need to do calibration curves, but there's not a lot of point until I make one image and get at least some idea of how it looks. The cyanotype layer often overwhelms the platinum layer, and people print it with less exposure time. I won't know until I try. And if I change the exposure time I have to recalibrate again. So to some extent I'm doing a few things that I know I'll have to fine tune later, just so I can get to the end. It's going to be a bit iterative.


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