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The term tannin (from Anglo-Norman tanner, from Medieval Latin tannare, from tannum, "oak bark") refers to the use of oak and other bark in tanning animal hides into leather. By extension, the term tannin is widely applied to any large polyphenolic compound containing sufficient hydroxyls and other suitable groups (such as carboxyls ) to form ...
Lagunaria patersonia is a species of tree in the family Malvaceae. [1] It is commonly known as the pyramid tree, Norfolk Island hibiscus, Queensland white oak, sally wood, [2] or simply as white oak on Norfolk Island. [3]
According to Rochleder (ibid lxiii. 202), the tannic acid of black tea is the same as that of oak-bark. [7] In 1880, Etti gave for it the molecular formula C 17 H 16 O 9. He described it as an unstable substance, having a tendency to give off water to form anhydrides (called phlobaphenes), one of which is called oak-red (C 34 H 30 O 17). For ...
Although called a white oak, it is very unusual to find an individual specimen with white bark; the usual colour is a light gray. The name comes from the colour of the finished wood. In the forest it can reach a magnificent height and in the open it develops into a massive broad-topped tree with large branches striking out at wide angles. [5]
In Korea, sawtooth oak bark is used to make shingles for traditional roof construction. [80] The dried bark of the white oak was used in traditional medical preparations; its tannic acid content made it astringent and antiseptic. [81] Acorns have been ground to make a flour, [82] and roasted for acorn coffee. [83]
The leaves are obovate to oblong, glabrous above, glabrous to densely grey-white hairy below, mostly 10–20 centimetres (4–8 inches) long and 5–14 cm (2– 5 + 1 ⁄ 2 in) wide (rarely up to 30 cm (12 in) long and 16 cm (6 in) wide), with 9 to 15 lobes on each side, and a 10–13 mm (3 ⁄ 8 – 1 ⁄ 2 in) petiole. The flowers monecious ...
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Early research by Humphry Davy in the early 19th century first demonstrated the use of catechu in tanning over more expensive and traditional oak extracts. Under the name cutch, it is a brown dye used for tanning and dyeing and for preserving fishing nets and sails. Cutch will dye wool, silk, and cotton a yellowish-brown.
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