Monday, December 1, 2008
I have been processing limestone for my upcoming class on Natural Glaze Materials . I found some limestone and put it in this bowl/saggar/container and bisque fired it. When it came out, it looked about the same so I added some water and it proceeded to decompose into this powder.
The bisque is driving off the carbon dioxide and so you have CaO. When you add water it is an exothermic reaction which turns the CaO back into cacium carbonate.