| 摘要 |
A scratch-off document may include a substrate. The substrate may include a front side and a backside with an information layer on the front side. An information layer may include an indicia component and a noise component. The noise component together with the indicia component may include a plurality of pile heights, and the indicia component may be visible when combined with the noise component. A scratch-off layer is included over the information layer so that the indicia component is not recognizable through the scratch-off layer.
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