Make Awesome Glowing Liquid at Home using the Insides of a Yellow Highlighter Pen!

This is so easy to do!

Extracting the fluorescent liquid from a highlighter pen to make glowing liquid is so easy for this amazing and cool science experiment. Yellow highlighter pens work best as they have a good quantity of fluorescein – the fluorescent chemical inside the cartridge.

We had a go at extracting fluorescein at home recently and we were amazed at how bright the fluorescent liquid was. The kids loved it, just pouring it into the containers was really satisfying. We wrote with it and drew pictures too, which looked awesome under UV light! As you can see from the video we made some mess, but it was easy to clean up and left no stains.  Fluorescein from these pens is safe to handle too.

Lets see how we did it and watch the video…..

Materials used

I used a couple of medium glass containers, a yellow highlighter pen, pliers, protection for work surface, gloves and a hand held UV blacklight (we have a UV lamp, but a torch worked too)

My method

Here’s how I extracted fluorescein from a highlighter pen:

First I protected our work surfaces and put on gloves as this part was messy!

Using pliers I broke open the highlighter pen, removed the cartridge and popped it into the glass with about 50ml of water and squeezed out the highlight pen ink into the water.

When I was happy that I’d got enough ink out of the pen, I called in the kids!

We switched on the blacklight and turned off the main light….and WOW! We had a lot of fun pour and playing with the fluorescein liquid n the UV lighting.

If you tackle this activity at home you do so at your own risk. If you have as much fun as we did, feel free to share your pictures with us on Facebook.

Bye for now

Ruth