Sotheby's finds hidden signature on Jean-Michel Basquiat painting

Sotheby's says it has discovered that grafitti artist Jean-Michel Basquiat secretly signed one of his paintings in invisible ink.

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Jean-Michel Basquiat - 20th c. & Co Lot 16 December 2020

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Jean-Michel Basquiat - 20th c. & Co Lot 16 December 2020

Untitled, Contemporary Day Auction, 2022

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