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2. Window film - Wikipedia

   en.wikipedia.org/wiki/Window_film

   Window tint on a convertible in America. Tint on the front window is lighter than on the back window because of window tint laws. Photo of vehicle with illegal window tint being measured at 2% light transmittance. Automobile window tinting reduces the "visible light transmission" (VLT) through car windows.

3. 2,5-Diaminotoluene - Wikipedia

   en.wikipedia.org/wiki/2,5-Diaminotoluene

   2,5-Diaminotoluene is prepared through electrolytic reduction of 2,5-dinitrotoluene. [3] Other methods include the reductive cleavage of 4-amino-2,3'-dimethylazobenzene as well as the condensation of 2-amino-1-methylbenzene and toluene-4-sulphonyl chloride to produce 4-toluenesulphono-2-toluidide which is then coupled with diazotized aminobenzenesulphonic acid and reduced.

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 ...