1. A method for predicting the appearance of a color print viewed under UV illumination, said method comprising the steps of: printing a multi-colorant target comprising a plurality of color patches each printed using a known coverage of one or more of a plurality of printer colorants; illuminating the target using a UV light source; capturing an electronic image of the multi-colorant target while illuminated with the UV light source, wherein said electronic image comprises a plurality of color signals acquired for each color patch of said multi-colorant target; computing from the plurality of color signals for each color patch, a prediction of color appearance value under UV light for that color patch; from the prediction of color appearance values for each color patch, deriving a UV printer characterization model that relates any arbitrary combination of said printer colorants to a predicted UV color appearance value, said predicted UV color appearance value for the said combination of printer colorants indicating a relative color appearance resulting from printing a document using such combination of printer colorants and viewing the document while the document is illuminated with a UV light source.