Line etching and brush etching with iron chloride on wove paper, 16.2 x 15.4 cm (plate), 32.5 x 25 cm (sheet). 1972. Provenance: Roger Passeron
Unique proof in black-grey. Signed and labelled "essai". Note in an unknown hand in the lower right margin "bonne pour noir" (good for black). Provenance: Ex collection Roger Passeron