RE: Hardening With Glyoxal: One Shot?
On Tue, 08 May 2007 09:41:15 +0300, "Loris Medici" <mail@loris.medici.name> said: > Hi Ryuji, > > I once refrigerated 8% gelatine solution (plain, w/o any biocide + > hardener) and reused it two weeks later w/o any problems. Just plain 8% gelatin for two weeks? I'm not sure, but if you clean everything thoroughly 2 weeks in good refrigeration may not completely degrade gelatin, especially if you heated the solution and the storage container hot enough to kill much of the bugs before storage. Unless the bacterial activity is suppressed, I do expect that the average molecular weight of the gelatin to be lower after 2 weeks than in the fresh solution. > More AFAIK, in > carbon printing, it's a common practice to prepare the "glop" (gelatine > + sugar + pigment + optional: glycerol) beforehand and remelt it when > necessary... How do you explain this fact? Depending on how much sugar and pigment are put into the solution, they may work as a mild bacteriostat.
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