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Kala Namak
Kala Namak or Himalayan Black Salt, also known as Sulemani Namak, Black Salt, Bit Lobon , Kala Noon or Bire Noon in Nepal, is a type of rock salt, a salty and pungent-smelling condiment used in South Asia. The condiment is composed largely of sodium chloride with several other components lending the salt its colour and smell. The smell is mainly due to its sulfur content. Due to the presence of Greigite (Fe3S4, Iron(II,III) sulfide) in the mineral, it forms brownish pink to dark violet translucent crystals when whole, and, when ground into a powder, it is light purple to pink in color.〔
==Production==
The raw material for producing kala namak was originally obtained from natural halite from mines in Bangladesh, India, Nepal and Pakistan in certain locations of the Himalayas salt ranges, or from salt harvested from the North Indian salt lakes of Sambhar Salt Lake or Didwana and the Mustang District of Nepal.
Traditionally, the salt was transformed from its raw natural forms into commercially sold kala namak through a reductive chemical process that transforms some of the naturally occurring sodium sulfate of the raw salt into pungent hydrogen sulfide and sodium sulfide. This involves firing the raw salts in a furnace for 24 hours while sealed in a ceramic jar with charcoal along with small quantities of harad seeds, amla, bahera, babul bark, or natron.〔〔 The fired salt is then cooled, stored, and aged prior to sale.〔 Kala namak is prepared in this manner in northern India with production concentrated in Hisar district, Haryana.〔 The salt crystals appear black and are usually ground to a fine powder that is pink.
Although the kala namak can be produced from natural salts with the required compounds, it is common to now manufacture it synthetically. This is done through combining ordinary sodium chloride admixed with smaller quantities of sodium sulfate, sodium bisulfate and ferric sulfate, which is then chemically reduced with charcoal in a furnace. Reportedly, it is also possible to create similar products through reductive heat treatment of sodium chloride, 5–10% of sodium carbonate, sodium sulfate, and some sugar.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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