| Chapter 7 | VAN DYKE BROWN PRINTS |
A brown print can be made on paper or fabric and can yield permanent images rich in detail, ranging from pale to deep Van Dyke brown. A photographic negative, when placed in contact with the silver-based emulsion, produces a positive picture after relatively short exposure to daylight or ultraviolet light. The longer the exposure, the darker the brown of the print. A brown print also reacts positively to such toners as Kodak Polytoner, gold selenium, sepia, Berg Copper, and Berg Blue (see Chapter 3, Toning) to produce purples, pinks, and blues. Brown printing, which is a relatively expensive process because of the cost of silver nitrate (one of its component chemicals), can be combined with other techniques ...
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