Architectural detail Cyanotype circa 1850. Matted to 11x14 Boehringer Gallery label on verso, Lot 2861 , Butterfield auction ca. 1994 a pioneering photographer, born in Grasse, France. He studied under the painters Paul Delaroche, Ingres and Drolling before establishing his own studio at 21 Quai Bourbon on the â•¬le Saint-Louis, Paris Signature: Unsigned. Medium: Print. Framing: Unframed/matted. Artist: Charles Negre. Size: 4 x 3.25 (sight).