In some cases refrigerating the ink will make it visible again, but not reliably. Leaving notes in your car can cause then to be erased. So these are a novelty or for casual use.
A fantastic use case though is in sewing. Ironing the fabric makes the ink transparent. These pens are far superior to chalk for that reason.
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In some cases refrigerating the ink will make it visible again, but not reliably. Leaving notes in your car can cause then to be erased. So these are a novelty or for casual use.
A fantastic use case though is in sewing. Ironing the fabric makes the ink transparent. These pens are far superior to chalk for that reason.
As long as your clothes are not to be worn in a sub-zero climate.