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I got this NFC-Tag and I try to do something, so that this tag can't be recognized by any nfc-tag-reader anymore. But I want to easily change this state, so that I can easily 'free' the nfc-tag so that it is working again.

What would be the best solution for this?

I thought about aluminium or other metal to place on my nfc-tag. This would work, but is there any other solution for my problem, not using any metal?

I am not an electrical engineer, so maybe my quesion is kind of stupid, I can't evaluate.

EDIT: I don't want to use metal, because if I place it on my nfc-tag, I can't see my tag anymore. Metal is very opaque. This is one of the reasons I am looking for different solutions.

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    \$\begingroup\$ Aluminum foil or thin metal is cheap. Why not use metal? There is no reason to look for another solution when the obvious one is right there. \$\endgroup\$ – Passerby Aug 12 '17 at 18:23
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    \$\begingroup\$ Engineers don't usually like "I don't want to use solution X" unless a reason is given. This mostly comes up here with "I don't want to use a microcontroller". \$\endgroup\$ – pipe Aug 12 '17 at 18:29
  • \$\begingroup\$ Seal it in a plastic bag and park it in a bucket of (salt) water. \$\endgroup\$ – JRE Aug 12 '17 at 18:54
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    \$\begingroup\$ Are shop-lifting questions off-topic? \$\endgroup\$ – Transistor Aug 12 '17 at 19:40
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    \$\begingroup\$ You can try holding it flat up against a dielectric puck. That may de-tune it sufficiently that it cannot be read. \$\endgroup\$ – mkeith Aug 13 '17 at 3:39

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