Definition: (1) Emulsion composition or paper coating characterised by use of iron with silver salts: processed to give a brown-coloured image. * Used in proofing printing plates on account of low cost due to use of iron salts. * Also known as brownprint, kallitype. (2) Map printing technique producing positive image, based on dichromated fish-glue, invented by F Vandyke, surveyor in India Office. (3) Earth pigment, partly organic, used in painting.

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