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Natural dyes are dyes or colorants derived from plants, invertebrates, or minerals. The majority of natural dyes are vegetable dyes from plant sources—roots, berries, bark, leaves, and wood—and other biological sources such as fungi. [1] Archaeologists have found evidence of textile dyeing dating back to the Neolithic period.
Turkey red was a strong, very fast red dye for cotton obtained from madder root via a complicated multistep process involving "sumac and oak galls, calf's blood, sheep's dung, oil, soda, alum, and a solution of tin." [43] Turkey red was developed in India and spread to Turkey. Greek workers familiar with the methods of its production were ...
Cocobolo heartwood contains oil, which lends a strong, unmistakable floral odor even to well seasoned wood and occasionally stains the hands with prolonged exposure. The high natural oil content of the wood makes it difficult to achieve a strong glue joint, as in applying veneers or guitar fingerboards, and can inhibit the curing of some ...
A woman with dyed pink hair. Hair coloring, or hair dyeing, is the practice of changing the color of the hair on humans' heads.The main reasons for this are cosmetic: to cover gray or white hair, to alter hair to create a specific look, to change a color to suit preference or to restore the original hair color after it has been discolored by hairdressing processes or sun bleaching.
Solvent dyes, for wood staining and producing colored lacquers, solvent inks, coloring oils, waxes. Contrast dyes, injected for magnetic resonance imaging, are essentially the same as clothing dye except they are coupled to an agent that has strong paramagnetic properties. [22] Mayhems dye, used in water cooling for looks, often rebranded RIT dye
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Solvay Chemical continued soda ash production through the 20th century. By 1980, the demand for soda ash plummeted. By 1985, the company had lost $55 million over the previous three years, forcing Allied Chemical (AlliedSignal at the time) to close and demolish the plant, dismissing 1,400 employees.
Let’s chat baking soda. Chances are you probably have a box chilling in the back of your fridge. But the white stuff, otherwise known as sodium bicarbonate, can do so much more than just absorb ...