ok , i'm gone write a mail to Frederic Mocellin. There is just one thing, Mr Mocellin don't use a glass for the Autochrome...he used polyester film.
And i'm not sure, but i read in the Lavedrine Book that they use Primal N580 for the first varnish. I call the society that make this product, but they just sell to industrie.
Perhpas he can tell me how he dyed the patatoe starch.
I think this material is polyurethane , may be 100 years ago , this term was not known but I am quite sure that car tires made from this. Polyurethane business is one of the largest chemical industry in the world and this material is used from tires , to interior of the cars to seats to vitesse stick to lenses .
Polyurethane is the one of the best and cheapest heat insulator in the world .
You find it at olympic shoes to Nike to bows to your television monitor plastic.
Without knowing what you want exactly technically , you cant find what you want. There are zillions of different formulas.
I think you must define whatever you want specially and contact with may be BAYER. I was thinking to build boats from polyurethane foams and 1 liter liquid comes to 3 dollars and expands to 60 liters with catalyzer.
I think if you define what speciallities you want , BAYER helps you. I hope you know what is BAYER.