Large Invisible Ink Marker,Medium Tip 2MM Water Based Invisible Securitas Uv Pen for Paper,Skin,Wood,Leather,Plastic,Cloth,Ceramics, Glass, Metal - Pack of 2

They work great. They even hold on metal, and manage almost complete invisibility on white paper! The price is right, too! They glow bright blue, btw. Be aware, it can rub off of surfaces. It's not permanent on skin or metal.

Why did you pick this product vs others?: I needed an exceptionally well built high visibility black light approved marker. I’m a master Locksmith and I do key impression on my YouTube channel door and lock tips these markers fit the bill perfectly with my high intensity black light that I also purchased from Amazon and my magnifier that Amazon, so graciously sells as well. I had to have markers that would seal and last and stay good for a long time and would not run or dry out these markers fit the bill perfectly if you’re looking for an exceptional high-quality permanent marker and I do mean permanent. These are the markers for you. I wouldn’t write on your face or places where you want this to come off because you’re gonna need some super scouring pads but these markers were great for me with metal keys. I highly recommend them sincerely Mike Walker with door and lock. Durability: Super well built high-quality. Functionality: I can’t ask for a better marker they function perfectly no run Value for money: The only ones I would buy the others are inferior for my use. Permanent is the answer for me. Write quality: It sticks to what you write it on, including metal Color variety: I didn’t care about color, but you can get that as well Use: Key impression is what I use them for and they stick to the metal perfectly

Worked well on picture window. Was hoping that the patterns drawn on the glass would help stop the birds from crashing into the window. Only helped a little.

No issues part of our Christmas hunt clue scavenger hunt. I needed a really small UV flashlight and they worked good.

I love it, it’s not visible without a black light. I’m only giving it 4 stars because it’s not great for textured walls. The tips shreds a bit and makes it messy. I’m still happy with the purchase overall tho.

So so cool! They work very well! Used on a huge rock to propose to my Girlfriend after a beach trip finding shells and rocks. Used our UV flash light to show the writing when we got home to check if anything was UV reactive. AMAZING!

Works great. I just wished one of them had a fine tip. But it works great

Work great,I will definitely buy again.

Works well! We used them for.our escape rooms!

Handy product. Recommended.

Excellent product! I used this to draw Rumi's kpop demon hunters demon pattern and it glows like magic in the blacklight!