Keith,
The reason your cyanotype image is fading when the gelatin is applied is
due to the nature of 'prussian blue'. This compound will fade irreversably
in any alkaline solution, and I suspect the gelatin or glyoxal/formaldehyde
solutions have a pH greater than 7. You could check this out with some pH
paper and adjust the pH of the solution to neutral. The border, being
denser, will be the last part to fade.
What effect this will have on the 'setting' properties of the gelatin is
anybodies guess. Or, you could stick with a Pthalo blue gum as an
underlayer and play safe. <g>
Tony McLean.
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