Oxblood

The French term sang-de-bœuf, or sang de bœuf, with the same meaning (but also "ox blood") is used in various contexts in English,[3] but especially in pottery, where sang de boeuf glaze in the color is a classic ceramic glaze in Chinese ceramics.

It is most commonly described as a dark red with purple and brown undertones.

The blood would change from a bright red to a darker, oxidized, more brown-red as it aged.

It is sometimes called "cordovan" although this term more properly refers to a particular type of horse leather.

[11] From 1903, the English architect Leslie Green used an industrial, solid, sang de boeuf glaze on the glazed architectural terra-cotta tiles for the exteriors of the stations of a large part of the London Underground system, which was then divided between a number of commercial companies.

Small 18th-century vase with sang de boeuf glaze
A pair of oxblood-colour Dr. Martens shoes
Russell Square station , Piccadilly line , with the oxblood tiles used on many London Underground station buildings.