In the 19th century it was suspected that R. couldn't have produced that many paintings. This led to a close look at the matter.
Many of the non-R's were done by R's contemporaries which have painted over forged signatures. Others have an authentic signature but weren't done by R. This came about because R. ran an art school and his students couldn't sign (By law as I understand it) and R. signed these, perhaps as a compliment.
I think this is why R. seems to have produced many inferior works which do not compare with his best.
Mani DeLi ...no skill no art
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