Disappearing Writing
If you squeeze the juice of a lemon and write with it, it will become visible when the paper is heated. Put some starch in the bottom of a cup, add some cold water and stir until you have a milky looking liquid. Then-add a few of iodine and stir well into this starch. When you write with this, after the ink is dry you can rub the writing off the paper with a cloth. If you buy some sodium bisulphate or some cobalt chloride and take a measure or two of this and add a little water, it will have the same effect that lemon juice ink has, with the exception that the cobalt chloride will turn blue when heated, and will disappear on cooling.
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https://paperspast.natlib.govt.nz/newspapers/BPB19481213.2.37
Bibliographic details
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Bay of Plenty Beacon, Volume 13, Issue 32, 13 December 1948, Page 5
Word count
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128Disappearing Writing Bay of Plenty Beacon, Volume 13, Issue 32, 13 December 1948, Page 5
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