Quote Originally Posted by Silverpixels5
We use glutaraldehyde to keep the bugs from eating the starches and polymers.
Glut is an excellent gelatin hardener and it would be consumed by the crosslinking reaction and won't work as a biocide in gelatin emulsion. (Glut doesn't harden phthalated and trimillitiated gelatins, so in these solutions, it mail remain effective, but only for a while, because the glut molecules are easily oxidized and/or polymerized.)