St. Patrick’s Day Science

Liven up the holiday with a little green science!

We never miss an opportunity to teach a little science… even on St. Patrick’s Day. From Leprechaun traps, to green water, to Leprechaun eggs, we know how to celebrate St. Patrick’s Day at the Spangler Science offices. Trust us, none of us will ever forget the day the toilet and faucet water turned green. Here are some of our favorite tips and tricks for infusing a little science and a lot of fun into St. Patrick’s Day.


Here are just a few ideas to get your green juices flowing. If you already have science staples like Insta-Snow powder, True Colors tablets, UV Beads or just some green food coloring, you’re well on your way to creating a very cool Irish science experience.

Leprechauns Strike – Green Water – It’s not uncommon for those little Leprechauns to turn everything green… even the water coming out of your faucet. Here’s how it works.

Green Flowers – It’s as simple as adding a little green food coloring to the water, but the effect it has on a white carnation is very cool. Children will be able to see how the water is absorbed into the plant as the petals of the carnation change color.

Green Instant Snow – Since everything else is green on St. Patrick’s Day, why shouldn’t the snow be green, too? You’ll need some Instant Snow powder, a few plastic cups, green food coloring and a stirring stick. Place 20-30 drops of green food coloring in an empty cup and add about a tablespoon (about 10 grams) of dry Insta-Snow powder to the cup. Use a stirring stick to mix the powder. The polymer will absorb the green food coloring, but it won’t fluff up. Add a few more tablespoons of the dry, white Insta-Snow powder to the green powder and continue to mix. Keep mixing in the dry Insta-Snow until you get the green color you want. When you’re ready to make green snow, place one teaspoon of dry, green Insta-Snow into a clean cup and add about 2 ounces (60 mL) of water. The erupting green snow will be a huge hit!

Leprechaun Traps – This is just one example of a simple Leprechaun trap that might spark a new idea.

Blarney Beads– At the end of every rainbow is a pot of gold, right? How about a bag of white beads that change to green in the sunlight? If you have the luck of the Irish on St. Patrick’s Day, the Leprechauns may leave some Blarney Beads for extra good luck. String the beads on a pipe cleaner and make a Blarney Bead Bracelet.

The beads are Color Changing UV beads (also known as Energy Beads). While you’re indoors, the beads remain white, but when you step outside into the sunlight, the beads change color. The beads contain a special UV sensitive pigment that changes color when it’s exposed to sunlight. The beads will change back to their original white color when you come back indoors. Given your creativity, you’ll be able to weave the magic tale.

How to Make Gold Pennies – When times are tough, even Leprechauns feel the pinch. What if that pot of gold was actually a handful of pennies? Not to worry… here’s a way to make gold pennies. (This is a chemistry activity that requires strong adult supervision and some chemical know-how.

Read about Leprechauns taking over the Spangler House!

Leprechaun Eggs – Ever seen a Leprechaun egg? Neither have we… but if they laid eggs, they might be magical in their ability to vanish! You’ll need some of our Jelly Marbles and some green food coloring. Jelly Marbles start out looking like BBs but grow to the size of big marbles when you add water. Place a teaspoon of Jelly Marbles into a bowl of water (1-2 liters) dyed with green food coloring. You’ll need to allow them to soak for at least 3 hours – overnight is even better. Once your Jelly Marbles have been in the water long enough they will have grown to an astonishing new size! And… they might look just like the kind of eggs a Leprechaun would lay!

Don’t be surprised if you don’t see the eggs in the bowl of water. They’re hiding right below the surface. Reach into the water and find them (and the kids will go nuts!). Take out a handful of Leprechaun eggs and drop them back into the green water to watch them vanish. It’s the science of refraction… but just enjoy the fun of it today.