Pumice

Science / Geology / Pumice: A vesicular volcanic glass of granitic composition. It has so many vesicles that it has a very low specific gravity - sometimes low enough to float on water. Picture of Pumice.

Gesso

Life Style / Painting / Gesso: In the broad sense it is a mixture of a plaster or like substance and a glue. Its purpose was to present the painter with a smooth, hard, white ground on which to paint. Owing to its hard brittle natu MORE

Abrasive

Science / Chemistry / Abrasive: A very hard, brittle, heat-resistant substance that is used to grind the edges or rough surfaces of an object. boron carbide, diamond, and corundum are abrasives. MORE

Vellum

Entertainment / Literature / Vellum: The skin of a young calf used as a writing surface--the medieval equivalent of 'paper.' A technical distinction is usually made between vellum and parchment, the latter is made from goatskin or sheeps MORE

Parchment

Entertainment / Literature / Parchment: Goatskin or sheepskin used as a writing surface--the medieval equivalent of 'paper.' A technical distinction is usually made between parchment and vellum, which is made from the hide of young calves. MORE

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