Fire Red UV Reactive Water Dye

Do they need some sort of liquid activator to combine with? Because these don't seem to glow at all to UV light.

I was very excited to use this and 2 other colors for a haunted house. One drop did very little. I ordered 3 colors, and they sent me 2 labeled blue - except one of those colors was CLEAR. The other blue came out light green after I used about half the bottle. The pink/red came out very light pink. After a few hours, all colors were very, very pale. None fluoresced under black light. Very disappointed. I didn't inspect the bottle labels until I was putting the drops into the water. I gave a score of "3" for easy to use since you just put the drops in the water. But you might as well use food coloring.

Smiles brings me warm cozy nurturing fMemories.

Works very well with my photo projects. I got this color plus the blue and green. You do have to be careful with skin staining but it isn't anything that can't be easily cleaned with soap and water. I use it with portable UV lights to create neat images having glow-in-the-dark water pour over models and it makes for some very cool pictures.

No LABELS,NO INSTRUCTIONS!

This works great for my needs. Has a very intense glow, but not so much if you use their recommended 5 drops per quart of water... i find that 5 drops in 2 oz of water gives me the intensity i'm looking for, and more accurate to the product image. A little still goes a long way.

Dyes come in very small bottles and honestly don't transform that much water. If you're looking for something to transform a gallon or so of water then this should be fine... if you're looking for something to transfer 55 gallons...not so much

Works great. I used it to fill a storm glass barometer and it's perfect. It's red under normal lighting and flouresces brilliant red under UV. I Used considerably more than the recommended 2 drops, because the top of the vial popped off, but it turned out perfectly.