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2. Photographic print toning - Wikipedia

   en.wikipedia.org/wiki/Photographic_print_toning

   Sepia toning is a specialized treatment to give a black-and-white photographic print a warmer tone and to enhance its archival qualities. The metallic silver in the print is converted to a sulfide compound, which is much more resistant to the effects of environmental pollutants such as atmospheric sulfur compounds.

3. Sepia (color) - Wikipedia

   en.wikipedia.org/wiki/Sepia_(color)

   Sepia toning is a chemical process used in photography which changes the appearance of black-and-white prints to brown. [2] [6] The color is now often associated with antique photographs. Most photo graphics software programs and many digital cameras include a sepia tone filter to mimic the appearance of sepia-toned prints. [2] [7]

4. Van Dyke brown (printing) - Wikipedia

   en.wikipedia.org/wiki/Van_Dyke_brown_(printing)

   Van Dyke brown is a printing process named after Anthony van Dyck. It involves coating a canvas with ferric ammonium citrate, tartaric acid, and silver nitrate, then exposing it to ultraviolet light. The canvas can be washed with water, and hypo to keep the solutions in place. [1]

5. Aquatint - Wikipedia

   en.wikipedia.org/wiki/Aquatint

   Aquatint is an intaglio printmaking technique, a variant of etching that produces areas of tone rather than lines. For this reason it has mostly been used in conjunction with etching, to give both lines and shaded tone. [1] It has also been used historically to print in colour, both by printing with multiple plates in different colours, and by ...

6. Architectural reprography - Wikipedia

   en.wikipedia.org/wiki/Architectural_reprography

   A related process is the sepia Diazo print, which produced either a positive or negative print in dark brown and light tones. The negative versions of these prints were most often produced as intermediaries, like the earlier Van Dyke process, to allow corrections and revisions without disturbing the original drawing.

7. Hand-colouring of photographs - Wikipedia

   en.wikipedia.org/wiki/Hand-colouring_of_photographs

   Hand-colouring is also known as hand painting or overpainting. Typically, watercolours, oils, crayons or pastels, and other paints or dyes are applied to the image surface using brushes, fingers, cotton swabs or airbrushes. Hand-coloured photographs were most popular in the mid- to late-19th century before the invention of colour photography ...