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2. Wella - Wikipedia

   en.wikipedia.org/wiki/Wella

   Wella AG is a German company specializing in hair care, styling, colorants, and other beauty products, and was founded in 1880 in Germany by Franz Ströher. Its headquartered in Darmstadt, Germany . The company was controlled by Procter & Gamble from 2003 until it was sold to Coty in 2015 along with some 40 other P&G brands. [ 1 ]

3. Photographic print toning - Wikipedia

   en.wikipedia.org/wiki/Photographic_print_toning

   Metal replacement toners replace the metallic silver, through a series of chemical reactions, with a ferrocyanide salt of a transition metal. Some metals, such as platinum or gold, can protect the image. Others, such as iron (blue toner) or copper (red toner), may reduce the life of the image. [citation needed]

4. Photographic developer - Wikipedia

   en.wikipedia.org/wiki/Photographic_developer

   In the processing of photographic films, plates or papers, the photographic developer (or just developer) is one or more chemicals that convert the latent image to a visible image. Developing agents achieve this conversion by reducing the silver halides , which are pale-colored, into silver metal, which is black when in the form of fine ...

5. Toner - Wikipedia

   en.wikipedia.org/wiki/Toner

   Toner may refer to: Toner (printing), a powder mixture used in laser printers and photocopiers; Toner (skin care), a water-based lotion, tonic, or wash designed to cleanse the skin in preparation for other skincare products; Hair toner, product used in hair dying; Toner cartridge, component of a laser printer which contains toner powder

6. Toner cartridge - Wikipedia

   en.wikipedia.org/wiki/Toner_cartridge

   A toner cartridge, also called laser toner, is the consumable component of a laser printer. Toner cartridges contain toner powder, a fine, dry mixture of plastic particles, carbon, and black or other coloring agents that make the actual image on the paper.

7. Laser printing - Wikipedia

   en.wikipedia.org/wiki/Laser_printing

   The toner particles are given a negative charge inside the toner cartridge, and as they emerge onto the developer drum they are electrostatically attracted to the photoreceptor's latent image (the areas on the surface of the drum which had been struck by the laser). Because negative charges repel each other, the negatively charged toner ...