
Armand Hippolyte Fizeau
b. 23 Sept 1819; d. 18 Sept 1896
One of the disadvantages of the Daguerreotype was that it was extremely delicate, consisting of small particles of soft silver- mercury amalgam on the plate, which could be ruined simply by touching the surface. One solution was to frame the picture behind glass. However in August 1840 Fizeau, a French physicist, published a method of toning the daguerreotype, which in addition to increasing the contrast, made the image stronger. This consisted of treating the finished image in a solution of sodium hyposulphite and gold chloride.
In 1845 Fizeau also took the first pictures of the sun, on daguerreotypes.
TERMINOLOGIA EN LA FOTO
Photography Language and terminology
PHONEOGRAPHY
Everyday photographers armed with a phone.
Historia de la Fotografia
Timeline of Photography history.