Ultikit Set of 3 Invisible UV Blacklight Ink Marker Blue Red Yellow

These are ok, they go on kind of light, and as someone said the yellow quickly becomes blue.I only bought them to mark where furniture goes back too after some big home improvement projects coming up, and for that purpose they work.

I was very excited to buy these Invisible Ink Pens. I was a bit disappointed when I saw that they had not Black Light attached to them. I, for some reason misread that the Black Light came attached to the Pen cap. It was my mistake. I still think they look good and are at a great price. I use them for numbering invitations, and the guest won't have to see the ugly number on the back. I did buy a separate keychain black light to work with them. I still like them and they come with color on the caps.

Pens go dry quickly and hardly show up in uv light. Can't really tell the difference between the yellow and blue. The color faded fast. I wish I could find other uv pens available

They work but are kind of low quality. I guess you get what you pay for.

Only two of the colors showed up under the light.

Not completely invisible but still nice

good product

I was quite disappointed: The yellow one turns to blue within a few seconds and one of the pens was nearly dried out from the beginning. Only the red one is very vivid and works well.