mordant
(1) a reagent for fixing coloring matter in textiles; (2) a corrosive substance such as acid used in etching.
Mordant is a colorless dye absorbing substance used in some forms of toning. The silver image is converted into a mordant then soaked in dye.
Mosaic is a composite made up from a patchwork of partly overlapping photographs.
 See also: Base, Alcohol, Wavelength, Function, Unsharp mask
  
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