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Alum production became popular during the beginning of the 17th century and lasted until 1871 (due mainly to other methods of production), when the last alum works (Kettleness and Boulby) were closed. The first successful use of alum in the uk in the making of a mordant was at Guisborough near Whitby in 1604 by the Chaloner family.
Alum is used to manufacture mordants. The textile and fabric industry depended on mordants for ensuring the dyes are retained and lasting after the fabrics are dyed. The main basic chemical components of a mordant are the alumina and sulphur (combined as aluminium sulphate). These components are the result of processing the two components found in the alum shale, aluminium silicates and iron pyrites (fools gold).

The processing of the shale was an incredibly long process. In the most simplest of terms the process can be described as this; shale was dug from the ground, it was then (calcified) burnt on top of a brushwood fire, once alight the shale produced it's own heat (exothermic reaction), more shale was then put on top over many months. The calcined shale was then put into water so liquor could be extracted, which was run off into separate tanks. The waste shale was discarded over the cliffs onto the sea shore. The liquor was then piped to a boiling house, using coal for it's source of heat. Potash or ammonia was added, usually extracted from burnt seaweed (plenty at whitby and along the coast around britain). The liquor was then cooled where by forming the alum crystals, these crystals become liquid again when heated.
Picture of an Alum Crystal

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