A process for imparting a simulated patina appearance to a copper substrate (11). The appearance of patination is created by applying interspersed spots (15, 16, 17) of colorant, preferably a paint, with the remaining portion of the substrate (11) being exposed for natural patination. The interspersed spots may be produced by screen printing, spattering/spraying, or by mechanical removal of colorant. Non-uniformity may be accomplished by varying the volume of colorant sprayed during the application process or by varying the relative movement of the spray and substrate (11). After application, the colorant provides a simulated patina to the copper substrate (11) surface while allowing the remaining non-coated portion of the substrate (11) to naturally patinate.
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