>>I used double weight fiber photopaper base material and gelatine sized
>>normal drawing paper.
>I would use DW fiber paper (fixed out and washed) as a final transfer
>paper. I would not use the same paper, or at least not the baryta coated
>size, to support the pigmented gelatin.
I got various papers from the Hungarian photographic material factory (Forte)
a few meters from the end of rolls (remainder) which was not useful of them.
So a part of these the papers without any coating but (a bit too) well
sized, because in a few cases the "developing" is too slow. (The paper
isolating the backside of the pigment tissue from water.) However,
it's working.
The most vicious thing: all processes of pigment need a sized paper-base,
except developing. The printing house used pigment papers had a solvent
soluble (water proof) layer on the backside of paper (true ResinCoated :-)
which was removable before water-developing. Good old times.
Balint Flesch
Ps: The main part of the world is a potential final transfer material
of the pigment. It is another question ;-).