Dont forget that the Formulary has a number of unlisted chemicals for emulsion making such as PMT (Phenyl Mercapto Tetrazole) and TAI (Tetra Aza Indene). These are excellent antifoggants and stbilzers that are used in a number of emulsions. With TAI (supplied as a powder or in solution) you can make your emulsion keep for a long time with no change in properties.