The difference between Alum and Potash alum
When used as nouns, alum means an astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium (k2so4.al2(so4)3.24h2o), whereas potash alum means alum, hydrated potassium aluminium sulphate, formula k2so4.al2(so4)3.24h2o.
Alum is also verb with the meaning: to steep in, or otherwise impregnate with, a solution of alum.
check bellow for the other definitions of Alum and Potash alum
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Alum as a noun:
An astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium (K2SO4.Al2(SO4)3.24H2O).
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Alum as a noun (chemistry):
Any similar double sulphate in which either or both of the potassium and aluminium is wholly or partly replaced by other univalent or tervalent cations.
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Alum as a verb (transitive):
To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.
Examples:
"rfquotek Ure"
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Alum as a noun (US):
A graduate of a university or other institution.
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Potash alum as a noun:
alum, hydrated potassium aluminium sulphate, formula K2SO4.Al2(SO4)3.24H2O