About the product
- Green pen: Automatically disappear, or quickly erasable by water.
- Purple pen: 2 to 14 days automatically fade or use water to wipe them off.
- Pink pen: 1-7 days disappear, or use water to wipe them off immediately.
- Dark Blue pen: Automatically disappear, or quickly erasable by water.
- Blue pen: writing trace does not disappear automatically, but it can easily and quickly erasable by water.
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