I reecieved below message from Metropolitan Museum of Art again . Here is the Autochrome dyed grains mixing ratios from 1930.

Luisa Casella says :

Since I used the dyes individually, my ratio is a little different.

The ratio depends on the year of manufacture.

The ratio I had from Bertrand from 1930 was:



ratio mass of starch in mg/ for solution in mg

for orange grains 1.3

for green grains 1.34

for blue-violet grains1.33

Best ,

Mustafa Umut Sarac

Istanbul