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2. Leather production processes - Wikipedia

   en.wikipedia.org/wiki/Leather_production_processes

   They include salt-free preservation systems, enzyme-assisted low-sulfide hair removal processes, [13] chemical-free enzymatic fiber opening, [14] ammonia-free deliming systems, pickle-free chrome tanning process, waterless chrome tanning technology, [15] chrome-free tanning methods, formaldehyde-free syntans [16] and solvent-free finishing ...

3. Hair bleaching - Wikipedia

   en.wikipedia.org/wiki/Hair_bleaching

   Bleaching the hair is a gradual process and different colors may be achieved dependent on the original hair color, application time, and strength of the product used. Applied on black hair, the hair will change its color to brown, red, orange, orange-yellow, yellow, and finally pale yellow. [19]

4. Conservation and restoration of leather objects - Wikipedia

   en.wikipedia.org/wiki/Conservation_and...

   Wet cleaning and solvent cleaning – The primary purpose of any wet cleaning on leather is to remove surface soiling. Leather should not be soaked in water. Soaking the leather can cause additional issues to arise, such as distortion, discoloration, hardening, movement of salts and tannins, and tidemarks.

5. 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.

6. Farouk Shami - Wikipedia

   en.wikipedia.org/wiki/Farouk_Shami

   He invented the first ammonia- free hair color, after developing an allergy to the chemical that initially led doctors to encourage him to leave his profession. [ 2 ] His company, the Houston-based Farouk Systems, currently employs 600+ people in the US, and exports its line of hair and skin care products under the BioSilk, SunGlitz and ...

7. Stain removal - Wikipedia

   en.wikipedia.org/wiki/Stain_removal

   Ammonia Ammonia is also contained in many hair dyes. [16] Hair colors containing ammonia have been safely used for years. However, ammonia exposure can cause conjunctiva irritation of the eyes. [17] Bleach Traditional bleach contains chlorine and/or hydroquinone. Chlorine can irritate and burn skin, as can skin-bleaching products [citation needed].