Today I tried to calibrate the new redeived Hahnemuehle Platinum Rag paper.
The paper was not external sized and the emulsion was excactly the same as I used to do with my standard paper Fabriano Artistico HP ex white which I normally size with a 3% gelatine solution, so I reduced the pigment volume.
Still Tonal Inversion present.
My conclusion HPR cannot be used for gum printing whitout sizing. So the next step is as usual; crimping and sizing the paper.
But HPR is still a nice paper lets see what happens after the water bath.