A series of works attributed to Jackson Pollock are being contested, after an analysis of the work uncovered paints not commercially available until after the artist’s death.  “The earliest forms of this class of pigment appeared on the commercial market in 1910 (PY1), with others following in the 1920s (such as PY4-6),” the report reads.  “However, the date of introduction of PY74 is commonly given in the literature as 1957. This consequently raises a number of issues.â€
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