Thomas S. Sinclair
Thomas Sinclair’s printmaking firm was known for color lithography, as it was one of the first in Philadelphia to experiment with color printing. Sinclair made his first color lithograph in 1843 and was awarded a silver medal from the Franklin institute. (Philadelphia on Stone: Commercial Lithography in Philadelphia, 1828-1878
edited by Erika Piola and published by Penn State University Press, 2012.)