BART cards demagnetizing - zoinks, a mystery
Here they are - 4, count them 4, demagnetized BART cards - it’s up to $100 worth, a freaking BART401k savings account. One lasted a meager 40 feet from purchase to demagnetization. The BART employees say you can go to their special station and get the value back, but who has time for that, and, I would need to to buy another ticket to get there! it’s a trap! Further testing is needed, I’ve tried to demagnetize them with cell phones and credit cards purposely (this is what the BART employees say kills the cards) - but in a controlled enviroment I cannot reproduce what seems to happen when I actually need to go somewhere and don’t have time to play Magneto. Developing story…
Resources and reference:
- BART cards - Link.
- 3 BART cards demagnetized 6/2005 - Link.
- “BART tickets are easily demagnetized (by credit cards) and destroyed by water.” - Link.
- Eel skin wallets and credit cards, Mythbusters - Link.
- Magnetic Stripe - Link.
- MTC Transit connectivity study (they note card demagnetization) - Link (PDF).
- Google - “Demagnetized BART cards” - Link.
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You know a really good way to demagnetize them? Place them right on top of a Sidekick for a few minutes (okay maybe an hour).
I know this because I’ve mistakenly placed my passes right next to my Sidekick in my bag. Only to find them completely useless when I attempt to use them. I think it’s because the Sidekick has such a strong magnet in its swiveling mechanism.
I had this problem until I started carrying them in my wallet (which ironically has a magnetic snap) and not in my jeans pocket. Is it possible that body heat has an effect? What’s the Néel temperature for a BART card?
Mine were demagnetized because of the magnetic clasp of my purse. I doubt that’s your problem though!