Porcelain derives its present name from the old Italian porcellana (cowrie shell) because of its resemblance to the translucent surface of the shell.
It has been defined as ware with a translucent body containing a minimum of 30% of phosphate derived from animal bone and calculated calcium phosphate.
Developed by English potter Josiah Spode, bone china is known for its high levels of whiteness and translucency, and very high mechanical strength and chip resistance.
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They also had a decorating studio in Limoges, France. My speculation is that this overglaze green stamp was provided for application on the whiteware after decoration with the flower pattern that was copied by the artists. This appears to be the stamp of the manufacturer of the board/paper used by artists for their creations.
Pattern name is Stamped label written in French which appears to say something about "Honorable Mention at Exposition Universelle of 1855, Papier, Carton, Chassis, Toiles, Anti-Ponce pour le Pastel, P. Apparently, he was given honorable mention for his products at the1855 Exposition.
PORCELAIN (also known as china or fine china) is a ceramic material made by heating materials, generally including clay in the form of kaolin, in a kiln to temperatures between 1,200 °C (2,192 °F) and 1,400 °C (2,552 °F).
The toughness, strength, and translucence of porcelain arises mainly from the formation of glass and the mineral mullite within the fired body at these high temperatures.
For some reason, most of the Dresden studios chose to hide the factory marks.