"Goya, ever ready for an artistic experiment, tried his hand at the comparatively new invention of aquatint. Several of the plates of are in pure aquatint (No. 32 is a fine example and how cleverly he succeeded is proved in 'A rough night' [= 'A Bad Night' [https://en.wikipedia.org/w/index.php?search=A+bad+Night+Goya&title=Special:Search&profile=default&fulltext=1&searchToken=dmndd6r6hf4vh49tura06ygnr ]. A recent historian of this method writes: "Goya raised the combination of etching with aquatint to a position of surpassing merit.. .He will always remain the master of mixed aquatint engraving, and his work should be carefully studied by all interested in the legitimate scope of aquatint engraving."