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An elderly Bengali man in Dhaka with a beard dyed in henna. Henna is a reddish dye prepared from the dried and powdered leaves of the henna tree. [1] It has been used since at least the ancient Egyptian period as a hair and body dye, notably in the temporary body art of mehndi (or "henna tattoo") resulting from the staining of the skin using dyes from the henna plant.
Lawsone (2-hydroxy-1,4-naphthoquinone), also known as hennotannic acid, is a red-orange dye present in the leaves of the henna plant (Lawsonia inermis), for which it is named, as well as in the common walnut (Juglans regia) [5] and water hyacinth (Pontederia crassipes). [6]
It is an isomer of lawsone, which is the active dye compound in the henna leaf. Juglone occurs naturally in the leaves, roots, husks, fruit (the epicarp), and bark of plants in the Juglandaceae family, particularly the black walnut (Juglans nigra), and is toxic or growth-stunting to many types of plants. [1]
Thousands of potentially toxic plastic chemicals can migrate from food processing and packaging into the human body, a new study found.
Lawsonia inermis, also known as hina, the henna tree, the mignonette tree, and the Egyptian privet, [4] is a flowering plant and one of the only two species of the genus Lawsonia, with the other being Lawsonia odorata. It is used as a traditional medicinal plant. [5]
10 Common Foods That Can Be Poisonous. Fruits, vegetables, seeds and beans are all essential parts of a well-balanced and healthy diet, but if these health gems are not consumed properly, they ...
Picramic acid is explosive and very toxic. It has a bitter taste. [5] Along with its sodium salt (sodium picramate) it is used in low concentrations in certain hair dyes, such as henna, it is considered safe for this use provided its concentration remains low. [6]
Although toxic, was used historically in Italy by women to enlarge their pupils, as well as a sedative, among other uses. The name itself means "beautiful woman" in Italian. [27]. Azadirachta indica: Neem: Used in India to treat worms, malaria, rheumatism and skin infections among many other things. Its many uses have led to neem being called ...