Michelangelo's Sistine Chapel painting, e.g. (6)

I believe the answer is:

fresco

(Other definitions for fresco that I've seen before include "Painting done in wet plaster" , "Method of painting on walls" , "Work of art" , "Wall-painting" , "Watercolour done on wet plaster" .)

I've seen this clue in The Wall Street Journal.

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