A photochromic flesh-colored pigment comprising not less than 90 wt % of anatase type titanium oxide having photochromism and a process for producing a photochromic flesh-colored pigment comprising the steps of adding iron hydroxide (FeOOH) to a composition containing untreated anatase type titanium...http://www.google.es/patents/US5176905?utm_source=gb-gplus-sharePatente US5176905 - Photochromic flesh-colored pigment and process for producing the same
Photochromic flesh-colored pigment and process for producing the same
