How do you know when your pen with invisible ink is empty?

ChaiTea2021-01-18T14:37:01Z

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20

Anonymous2021-01-22T17:57:22Z

When it's empty, the cartridge becomes visible. doh. otherwise how else would you know?  

10

David2021-01-18T15:56:38Z

It becomes less in weight.

20

?2021-01-18T14:55:02Z

That's how they get you. They'll tell you that you need to buy more ink even if you don't. Thats why I don't purchase invisible products. It's just a headache waiting to happen 

20

Big Kahuna2021-01-18T14:19:08Z

I have pen with invisible ink;I have pineapple.

10
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