Crossword Genius

The Sistine Chapel has many such paintings (6)

Ross

I believe the answer is:

fresco

(Other definitions for fresco that I've seen before include "Artwork" , "Picture painted on wall or ceiling before plaster is dry" , "Mural painting" , "Method of painting on walls" , "Watercolour done on wet plaster" .)

I've seen this clue in The Guardian.
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