alum background

alum

/ˈæl.əm/ /əˈlʌm/

Illustration alum - Image 1

noun

Alun

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).

Examples :

"The potter used alum to help set the dye and make the colors brighter on the clay pots. "

Le potier utilisait de l'alun pour fixer la teinture et rendre les couleurs plus vives sur les pots en argile.

compound substance chemistry material medicine industry science

Illustration alum - Image 1

noun

Alun

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.

Examples :

"The chemistry student identified the unknown crystal as an alum, noting its composition included sulfate and a mix of aluminum and potassium ions, characteristic of this class of double salts. "

L'étudiant en chimie a identifié le cristal inconnu comme de l'alun, notant que sa composition comprenait du sulfate et un mélange d'ions aluminium et potassium, caractéristiques de cette classe de sels doubles.

compound substance chemistry material science

Illustration alum - Image 1

verb

Imprégner d'alun, traiter à l'alun

To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.

Examples :

"To strengthen the fabric, the seamstress alummed the delicate silk. "

Pour renforcer le tissu, la couturière a traité la soie délicate à l'alun.

chemistry substance material process

Illustration alum - Image 1

noun

Ancien élève, diplômé

(shortening) A past attendee or graduate (of either gender) of a college, university or other educational institution.

Examples :

""My father is an alum of Harvard University, graduating in 1985." "

Mon père est un ancien élève de l'université Harvard, diplômé en 1985.

person education group organization past achievement