With built in uv Light, Kids will write plenty of secret messages to each other and its not visible to the naked eye turn the uv light on the writing appears
2.You can write on most surfaces, but whether it can stay on the surfaces
It depends on what kind of the material you write on.
If you write on the papers, it can stay on permanent; if you write on the metal or plastics
It may couldn't last long, because it will be erased easily due to the characteristic of the metal and plastics.
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