Hair dyes vegetable

Hair dyes are of two types permanent and semipermanent. Permanent dyeing is achieved with a synthetic dye, applied with hydrogen peroxide that first bleaches the natural pigment melanin. Semipermanent dyes are generally made with vegetable extracts, such as henna, that coat rather than penetrate the hair shaft. There are a number of questions about the safety of synthetic hair dyes, since some of the products they contain cause cancer. 

Uses Dye for fabric, leather, cotton, cellulosic materials, paper, wool, silk, hog s hair, plastics, vegetable-ivory buttons, wood flour used as a resin filler, acetate, and nylon stain... 

Hazardous Decomp. Prods. Heated to decomp., emits toxic fumes of NOx Uses Dye for heating oil colorant for spirit lacquers, cosmetics, hair dyes, external pharmaceuticals stain for zoological, pathological, and vegetable objects like wax, cutin, resin... 

Furthermore, the types of yam structures that Willoughby (5) described in the Seip textiles as vegetal core with red-stained rabbit hair wrapped around if can only be achieved in coloring the fibers before spinning. Therefore, the prehistoric artisans had to have specific knowledge about dyes and how to apply them. 

Henna. Henna is the oldest and most widely used vegetable dye utilized in hair coloring. A temporary chestnut color is produced in blond or auburn hair by applying a paste of henna flowers and leaves ground in hot water immediately before use. (The dye is unstable in aqueous solution.) The addition of indigo achieves darker blue-black shades extracts of walnut shell or logwood enhance brown coloration. 

Most vegetable dyes are applied to natural animal or plant fibers that have already been spun into yarn or thread. Some, like henna (Lawsonia inermis) are used as dyes for hair, leather, paper, and wood, and may be used as pigments for painting on various materials, including skin. Henna is commonly used for body decorations and temporary henna tattoos. ... 

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