Blacklight Reactive Electric Neon Permanent Fabric Markers 5 Pack with DirectGlow UV Keychain Light
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Questions & Answers
When they are lit up by the sun, their colors are vibrant
Unlike glow-in-the-dark items, they do not glow when the lights are off
It is true that the markers are able to write on walls without any issues.
As long as there is some porous surface, they can adhere to it. You shouldn't try to make your design smooth and flat.