It was described as a watercolour. 1
Whistler rarely painted in watercolour at this date although there is quite a lot of gouache in Study for 'Harmony in Grey and Peach Colour' [M.0469] and it is possible that this was the work exhibited.
1: Anon., 'Winter Exhibitions. New British Institution', The Architect, vol. 8, 9 November 1872, p. 256.
Last updated: 22nd February 2021 by Margaret