Ok, so it's coming full circle now. I was searching for fish glue because it's mentioned quite a bit in old literature on carbon type processes. Anyways, the liquid gelatin was fascinating in it's own right, but I see now that all of this stuff is technically "fish glue", a.k.a. gelatin made from fish. It appears that all of it stays liquid at room temperature.

Here, the use of dichromates with fish glue is specifically mentioned.

I'm quite curious about its other properties, but being able to pour carbon tissues without a heated water bath for the emulsion is one obvious advantage.