Page 241 - Summaries of Boccaccio's Decameron: A Visionary Journey in 100 Stories and 100 Etchings by Petru Russu

Etching, an age-old practice, uses potent acid to meticulously corrode the
uncovered sections of a metal surface, producing ink-retaining, sunken
designs. (Petru Rusu in 13 / 04 / 1986 intaglio printmaking the 100 Days of
Decameron on H. Fleury printing press manufactured in Paris in the 1880s.)