| 摘要 |
The sticker contains a flat base member made of a water-permeable material, a water-resistant ink layer on a top surface of the base member, a water-soluble dye layer on a bottom surface of the base member, and an adhesive layer on a bottom surface of the dye layer for attaching the sticker to a lottery ticket. The ink layer has a graphical or text image of the same color as the base member so that the image wouldn't be visible. The dye layer has a different color from that of the base member and the ink layer. The dye layer is water-soluble so that, once it is contacted with water, it is dissolved into the water and permeates into the base member. Due to the color difference, the image of the ink layer then becomes visible.
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