An organic compound found in the roots of some madder plants and the chay plant (Oldenlandia umbrella), all belonging to the family Rubiaceae. It was historically used as a red dye in textile production.
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A naturally occuring gum obtained from the hardened sap of the Acacia senegal and Vachellia seyal trees and traditionally used…
Lightweight construction brick developed during the 1800s in the US, Europe and Australia by binding Portland cement with coke breeze,…
The fruit of the black myrobalan plant (Terminalia Chebula), it is used to make a natural dye for textiles such…
An acidic solution that is used to stop the development of photographic film once it is sufficiently developed. It acts…
Moulded terracotta tiles popularly used on sloping roofs in India, first manufactured in 1864–65 by the Basel Mission Tile Works…
Fibre derived from the hair of Angora goats, it is used to make mohair yarn and fabric. It is known…
In photography, a chemical solution used in the final stage of processing photographic film. It contains sodium or ammonium thiosulphate,…
Textile fibre derived from the hemp plant Cannabis sativa, which also yields oilseeds, and leaves and flowers with psychoactive properties…