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A development by Dr. Mike Ware of Kallitype and Van Dyke Brown, Argyrotype produces brown silver prints of subtle graduation on plain artist's paper. The sensitiser, which can last a year or more if correctly stored, should be spread evenly on the print using a glass rod. After a few minutes to allow it to soak in, the print should then be dried for ten minutes at 40C or for half an hour at least at room temperature. A contact printing time of 5-10 minutes under the sun or a good source of UV light is normal. After exposure, develop and clear the print in gently running water for around 5 minutes, and then use a fixing solution for 3 minutes. At this point the colour will intensify, changing from red to a deep brown, which can be turned more blackish-brown by ironing dry at this stage.