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All things Chiba and Dichromate alternatives.

From the brief experience I had with hide glue and CHIBA process, it didn't need any O2 barrier. The hardening happened just fine. Habib Saidane in his myriad combinations of materials/process never uses one. So it must not be critical requirement. In theory, O2 is a quencher in a free radical reaction hence the caution in the original thesis paper.

:Niranjan.
 
BrendanOrner said:
Is there much evidence of CO2 bubbles from the citrate decarboxylation? I'm reminded of DAS forming nitrogen during carbon transfer.
Click to expand...

When I spray or dunk the exposed tissue to H2O2 0.3% I do see tiny bubbles form on top of the emulsion. It doesn't seem to cause big visible spots on an image though. However, I also never used an agar agar cover.
 

It might be related to the fact that Chiba as I recall explored alternatives for a transfer process; the direct pigment processes don't involve a transfer. I might not remember that bit correctly though.
 
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