Juan, You said
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Most manufacturers mix some pigments to get the "look" of the v.D. brown using carbon or lamp black (PBk 7 or PBk 6) and some combination of Burnt Umber/Sienna (PBr 7)."
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I have a 200ml tube of WN Van Dyke Brown (a flea market find) It is PBr 7. Will it "slide" over time or can i use it?