Turpinoid on paper
Do not use tupentine or tupenoid on paper!! It is seriously dangerous to the paper; use rubber cement thinner instead. I think the "not blending" is more a modern caveat than a hard and fast rule. La Tour, Largilliere, Liotard etc. blended. I was just at a portrait show in Boston (the Vose Gallery), an artist Shirley Pulido had the most exquisite blended pastels. However, you will have fresher, clearer skintones if you use closely related colors, rather than trying to blend too many disparate tones.
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