    Mark Rothko, Untitled [No.4],1964, National Gallery of Art, Gift of The Mark Rothko Foundation, Inc.,1986.43.152 With some exceptions, the darkened palette continued to dominate Rothko's work well into the 1960s. He developed
a painstaking technique of overlaying colors until, in the words of art historian Dore Ashton, "his surfaces were velvety as poems of the night."   
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