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identification of a powder

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I lost the label of a product in my supplies.  It looks and feels like limestone (chalk), which I thought it was.

I have put some in the bottom of my kiln (to avoid adherance of my stuff), but it melted (at 1115 ˚C). Imagine the disaster.

Any idea what it can be? Thanks.



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Hmm, no idea what it is but chalk would be calcium carbonate which melts around 900 c. I think maybe you intended to use alumina to prevent things from sticking not calcium carbonate. This still could be chalk or calcium carbonate and a flux ingredient for your glazes. Maybe see if it reacts with vinegar and produces lots of Carbon dioxide bubbles like in a carbonated soft drink.

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