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How are postage stamps voided? Answered


Hello, 

How do the UK postal service know if a stamp has been used before?, (Sometimes they do not have a postal mark across them).

I think that it used to have something to do with phosphorous dots... um....

Thank you


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steveastrouk
steveastrouk

Best Answer 11 years ago

They are marked with special UV sensitive inks

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FriendOfHumanity
FriendOfHumanity

Answer 11 years ago

 Thank for the reply.
Do you mean that as the envelopes are scanned, any with uv ink on are rejected?

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steveastrouk
steveastrouk

Answer 11 years ago

Yep. If they detect them, the letter would be delivered, but with the Royal Mail's own little fine attached.

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orksecurity
orksecurity

Answer 11 years ago

Interesting. I've started seeing apparently-uncancelled stamps in the US mail; I'll need to investigate. (I know someone who would know the answer.)

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caarntedd
caarntedd

11 years ago

I don't collect stamps, but don't some collectors want stamps with a visible postmark?

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lemonie
lemonie

11 years ago

These things go through machines, if you tried a re-use the recipient would be charged £1.50.

L