| 摘要 |
A test form comprises a substrate, a chromogenic material applied to at least a top surface portion of the substrate, a removable opaque layer overlaying a portion of the chromogenic material, the chromogenic material being adapted to irreversibly generate a visible change in color to form a desired indicia, upon exposure of the area to an activating agent such as heat to predetermined areas on a bottom portion of the substrate, all without disturbing the opaque layer covering the indicia so produced. The present invention is further directed to a method and system for customizing a test form having a removable opaque layer, by permitting printing under the opaque layer to be concealed until the corresponding opaque layer covering the indicia is removed.
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