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Large deposits of alum occur close to the village of Bulladelah, 30 m.
Alum and blue vitriol (sulphate of copper) are manufactured from decomposed schists at Khetri in Shaikhawati.
Potash alum is the common alum of commerce, although both soda alum and ammonium alum are manufactured.
Instead of the sweet taste she expected, it was bitter - like alum.
The output of alum averages 4000 to 5000 tons a year, and is mostly exported from Civitavecchia.