Hi PE and All,
My first water solubility tests indicate that niether formalin nor glyoxyl will cause a film of the kuraray polymer to become insoluble in Hot water. Both films eventualy dissolved, totaly. But the dried film, and the emulsion, are very hard on the gl;ass plate. Very difficult to scratch the surface or remove the film from the glass. I know at least one emulsion maker who makes gelatin plates, and never uses hardener.