I recently travelled to the USA from Asia.
When I arrived in Detroit they marked my E-cigarette with a clear colorless liquid using a small paint brush used for water colors.
What chemical(s) do they use as markers?
They are known as taggants. I found an article about them on Wikipedia.
Hope it helps.
Sign up using Google
Sign up using Facebook
Sign up using Stack Exchange
10 months ago
8 months ago