Summary: The bills were made by first bleaching $1 bills then overprinting as a $100. Detector pens use iodine to detect ordinary paper and did not react with these bills. However, rubbing alcohol will smear the ink to detect fakes. Also the bills lack a security strip and watermarks.
I think "bleaching off a low-denomination note and printing a higher denomination on the blanked banknote" has been a counterfeiting technique to foil the detector pen for a while now. Making it harder to do this was the main reason why the different denominations are made more distinctive in terms of background inks and physical differences such as different security threads for each denomination.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
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