Uniclife 3 Pcs Invisible Ink Pen with 3 Pcs UV LED Keychain Flashlight, Spy Pen, Disappearing Ink Magic Pen for Secret Notes, Magic Spy Marker with Purple Light for Christmas Halloween Holiday Present

The fluorescent is paint by invisible UV marker I found on Amazon and paint over metal paint. Amazon link: https://www.amazon.com/dp/B0D25GF89B?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 Just notice the one I got have issue with green makrer is watery and not as effective as the blue and red one. It's also my first time work with this invisible marker so I can't said I have master how to work with it yeat.

I found some Invisible Ink Pen that clear under normal light. So I try top coat it over other paints. Amazon link: https://www.amazon.com/dp/B0D25GF89B?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 Just notice the one I got have issue with green makrer is watery and not as effective as the blue and red one.

I found some Invisible Ink Pen that clear under normal light. So I try top coat it over other paints. Amazon link: https://www.amazon.com/dp/B0D25GF89B?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 Just notice the one I got have issue with green makrer is watery and not as effective as the blue and red one.