François Boucher, Fountain with Two Tritons Blowing Conch Shells, c. 1736, Black chalk with stumping, and red chalk, heightened with white chalk on beige laid paper, Cleveland Museum of Art, Cleveland. https://dartabase.art/cite/cleveland/130150

Giovanni Battista Piazzetta, A Young Woman Buying a Pink from a Young Man, c. 1740, black crayon (wetted and rubbed) heightened with white chalk on faded blue paper, Cleveland Museum of Art, Cleveland. https://dartabase.art/cite/cleveland/117766