Visual meaning of 'alum'? - learn with images, example in daily life

Visual illustration of alum: 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).

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).

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

compound substance chemistry material medicine industry science

Visual illustration of alum: 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.

noun

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.

"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. "

compound substance chemistry material science

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

verb

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

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

chemistry substance material process

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

noun

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

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

person education group organization past achievement