Have you had any time to pick up on this again(you mentioned some Pt work
you needed to finish 1st)?
One area certainly worth checking out are the synthetic substitutes as
they should be far more consistent. I haven't yet tested my sample of
Gloy from the APIS, but I will. One product that I have found to work in
place of gum in my formulations is a litho product by Hanns Eggen -
Sarstedt (German) called Eggen Agum 'O'.
Sincerely, Art
Art Chakalis
Columbus, Ohio, USA