Alum Meaning: Definition, Examples, and Translations
๐งช
alum
[หรฆl.ษm ]
Definition
chemical compound
Alum is a chemical compound, typically a hydrated double sulfate salt, that contains a metal ion such as potassium or aluminum. It is often used in various applications, including water purification, food processing, and as a mordant in dyeing processes. Alums are also recognized for their astringent properties, which can be beneficial in medical practices. The chemical formula for the most common type of alum is KAl(SOโ)โยท12HโO, known as potassium alum.
Synonyms
aluminum sulfate, potassium aluminum sulfate, tartar emetic.
Examples of usage
- Alum is used to purify drinking water.
- Potassium alum serves as a mordant in textile dyeing.
- In cooking, alum can be used as a food preservative.
- Some cosmetics contain alum for its astringent properties.
Translations
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Origin of 'alum'
The term 'alum' originates from the Latin word 'alumen', meaning 'bitter salt' or 'to flow'. This itself can be traced back to the Greek word 'alumos', which refers to a type of salt with astringent properties. Historically, alums have been known since ancient times, with applications in various cultures for dyeing fabrics and as a food preservative. In medieval Europe, alum was highly valued for its use in textile dyeing, leading to the establishment of alum mines, particularly in Italy and England. The discovery and commercial production of alum contributed significantly to the textile industry during this period.