May be We can overcome with press problem with pressing the dyed grains before the coating in homemade smaller press in very small batches.

Than we collect all flatten grains ,

coat a flat glass with this flat grains , and of course they will lie on the glass surface with lots of angles.

We apply vibration or we close a second teflon plate on to the surface and hand press the grains with this second teflon plate while moving it to the right left .

Whenever we sure that every grain is parallel to the glass plate , we remove the teflon plate and take the adhesived autochrome plate and make them kiss .

And another question to you :

Do autochrome plate we made , contact copy the original French one exactly the same ?

If yes , We can make experiments until get the correct materials and methods until we get twins.

Best ,

Mustafa Umut Sarac