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2. The Best At-Home Hair Color for Women, According to DIY Dye-ers

   www.aol.com/best-home-hair-color-women-200000863...

   2. Clairol Age Defy Permanent Hair Dye. Best for Grays. For those with especially stubborn grays, this permanent color is a fan favorite for full coverage that lasts up to eight weeks. The pointed ...

3. Hair coloring - Wikipedia

   en.wikipedia.org/wiki/Hair_coloring

   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.

4. p-Phenylenediamine - Wikipedia

   en.wikipedia.org/wiki/P-Phenylenediamine

   p-Phenylenediamine (PPD) is an organic compound with the formula C 6 H 4 (NH 2) 2. This derivative of aniline is a white solid, but samples can darken due to air oxidation. [1] It is mainly used as a component of engineering polymers and composites like kevlar. It is also an ingredient in hair dyes and is occasionally used as a substitute for ...

5. Fischer–Saller scale - Wikipedia

   en.wikipedia.org/wiki/Fischer–Saller_scale

   The Fischer–Saller Scale, named for eugenicist Eugen Fischer and German anthropologist Karl Saller [de], is used in physical anthropology and medicine to determine the shades of hair color. The scale uses the following designations: [1][2][3][4] A. very light blond.

6. Dye - Wikipedia

   en.wikipedia.org/wiki/Dye

   Dye. Drying colored cloth. Chemical structure of indigo dye, the blue coloration of blue jeans. Although once extracted from plants, indigo dye is now almost exclusively synthesized industrially. [1] A dye is a colored substance that chemically bonds to the substrate to which it is being applied. This distinguishes dyes from pigments which do ...

7. CMYK color model - Wikipedia

   en.wikipedia.org/wiki/CMYK_color_model

   The CMYK color model (also known as process color, or four color) is a subtractive color model, based on the CMY color model, used in color printing, and is also used to describe the printing process itself. The abbreviation CMYK refers to the four ink plates used: c yan, m agenta, y ellow, and k ey (black).