Art technique employing thickened paint (7)

I believe the answer is:

gouache

(Other definitions for gouache that I've seen before include "Painting with colours mixed with gum" , "Painting style or technique" , "Watercolour painting with opaque colours" , "Opaque watercolour paint" , "Watercolour mixed with gum" .)

I've seen this clue in The Times.

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