| US 7,532,226 B2 | ||
| Bleaching the background of a medium | ||
| Andrew L. Van Brocklin, Corvallis, Oreg. (US); Makarand P. Gore, Corvallis, Oreg. (US); and Jayprakash C. Bhatt, Corvallis, Oreg. (US) | ||
| Assigned to Hewlett-Packard Development Company, L.P., Houston, Tex. (US) | ||
| Filed on Aug. 01, 2005, as Appl. No. 11/194,221. | ||
| Prior Publication US 2007/0024695 A1, Feb. 01, 2007 | ||
| Int. Cl. B41J 2/435 (2006.01) | ||
| U.S. Cl. 347—224 | 22 Claims |
| 1. A method of producing a label on a markable medium, comprising:
forming optically visible marks in a relatively dark radiation-sensitive coating disposed on the markable medium by exposing
first portions of the radiation-sensitive coating to first electromagnetic radiation having a first wavelength to form the
marks while the markable medium is positioned in a marking device; and
bleaching second portions of the radiation-sensitive coating not exposed to the first electromagnetic radiation using second
electromagnetic radiation having a second wavelength by exposing the second portions of the radiation-sensitive coating not
exposed to the first electromagnetic radiation to the second electromagnetic radiation while the markable medium is positioned
in the marking device so as to produce a relatively lighter background in the second portions of the radiation-sensitive coating;
wherein the first wavelength and second wavelength are different; and
wherein bleaching the second portions of the coating enables material located beneath the coating to be optically visible
at the second portions.
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