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On right, oak extraction. The two are mixed immediately prior to use to produce the ink, centre. The ink was traditionally prepared by adding some iron(II) sulfate (Fe SO 4) to a solution of tannic acid, but any iron ion donor can be used. The gallotannic acid was usually extracted from oak galls or galls of other trees, hence the name.
Cutch is an ancient brown dye from the wood of acacia trees, particularly Acacia catechu, used in India for dyeing cotton. Cutch gives gray-browns with an iron mordant and olive-browns with copper. [49] Black walnut (Juglans nigra) is used by Cherokee artists to produce a deep brown approaching black. [28]
A purée (or mash) is cooked food, usually vegetables, fruits or legumes, that has been ground, pressed, blended or sieved to the consistency of a creamy paste or liquid. [1] Purées of specific foods are often known by specific names, e.g., apple sauce or hummus. The term is of French origin, where it meant in Old French (13th century ...
The materials used to wax produce depend to some extent on regulations in the country of production and/or export. Both natural waxes (carnauba, [12] shellac, beeswax or resin [4]) and petroleum-based waxes (usually proprietary formulae) [3] are used, and often more than one wax is combined to create the desired properties for the fruit or vegetable being treated.
Quercitannic acid is one of the two forms of tannic acid [4] found in oak bark and leaves. [5] The other form is called gallotannic acid and is found in oak galls.. The quercitannic acid molecule is also present in quercitron, a yellow dye obtained from the bark of the Eastern black oak (Quercus velutina), a forest tree indigenous in North America.
Juglone, also called 5-hydroxy-1,4-naphthalenedione is a phenolic organic compound with the molecular formula C 10 H 6 O 3.In the food industry, juglone is also known as C.I. Natural Brown 7 and C.I. 75500.
Potato starch slurry Roux. A thickening agent or thickener is a substance which can increase the viscosity of a liquid without substantially changing its other properties. Edible thickeners are commonly used to thicken sauces, soups, and puddings without altering their taste; thickeners are also used in paints, inks, explosives, and cosmetics.
These differences become manifest as a color when the two dispersion curves intersect for some visible wavelength. This is an optical staining technique and requires no stains or dyes to produce the color. Its primary use today is in the confirmation of the presence of asbestos in construction materials [1] [2] [3] but it has many other ...