Content A Little Bit about the history of the pigment Making of thenards blue Result
Thenards Blue/ Cobalt BlueCobalt blue in impure form had long been used in Chinese porcelain, but was independently discovered as a pure alumina-based pigment by Louis Jacques Thénard, in 1802 Germany was also famous for production- especially the Blaufarbenwerke ("blue-color works," in German) of Schneeburg. The dye is not to be confused with Prussian blue, which is an intensely-blue pigment based on iron and cyanide, that contains no cobalt.
Isolation of Thenards BlueThenards Blue is a deep blue pigment, which isused as a colour for ceramics, due to its chemical resistance. Cobalt blue is toxic when inhaled or ingested. Potters who fail to take adequate precautions when using cobalt blue may succumb to cobalt poisoning
Procedure Weight and mix 0.85 g of Cobalt- carbonate(CoCO3), 1g of Aluminium- oxide(Al2O3) and 2,75 g of Potasium-chloride (Kcl) in a mortar Put this mixture in a fire-proof container and cover it Put it in the microwave (850W) for 5 minutes
Procedure After cooling, and crashing in the mortar, boil it in a baecker with 10 ml of Hydrochloric acid Then wash it with 25 cl of water → solid is filtrated and dried
Observations and evalutionThe Educt-mixture is dark gray → a deep bluepowder → colour becomes more intensive after boiling with Hydrocloric acid CoCO3 + Al2O3 → CoAl2O4 + CO2
Thank you for the attention it was fun to work on this project for us we hope we havent bored you :)