So I had researched it a while ago and don't recall having found anything effective and non-suspicious to protect from public camera mass survaillence in cities and the like. Is there anything that is a good option for that yet, and if so, could you point me toward it?

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[–] 2 points 1 year ago*

I’m thinking it’s a conflation with a basic “invisible ink” made with lemon juice.

You write a message in lemon juice on paper; the juice dries clear, then you can heat the paper to darken the juice and make the message legible.

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