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Originally Posted by asnowsquall
Need to learn more about the majic special pen/marker....
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Everything you want to know about that pen is contained in two words: Iodine and starch.
Iodine reacts with starch and turns black. In the absence of starch, it remains brown. Most buyers have no idea that it is this simple of a device, and is defeated by simply printing on unstarched paper.