“The gravure printing will be without doubt one of the most beautiful and complete conquests of modern science. “ by H. de la Blanchère, 1861
Printing with printing ink alone could produce these images, and heliographic engraving, invented by M. Niepce de Saint-Victor, made this difficult problem possible. Selfless inventor, he did not apply himself, but his few students extended and perfected his procedures. MM. Riffaut and Ch. Nègre obtained very fine results. Finally MM. Baudran and De La Blanchère have just brought this art to a final improvement, by applying heliographic engraving without retouching to portraits, reproductions and landscapes. The gravure printing will be without doubt one of the most beautiful and complete conquests of modern science. Eder
Encyclopedic photographic repertory: including in alphabetical order all that has appeared and appears in France and abroad since the discovery by Niepce and Daguerre of the art of printing by means of light, and the notions of chemistry, physics and related perspective / by H. de la Blanchère., v.1.
Eder, Josef M, and Edward Epstean. History of Photography, by Josef Maria Eder. Translated by Edward Epstean. New York: Columbia University Press, 1945. Print.