Magical Color-Changing Punch is such a fun birthday party trick for kids! Magically turn blue punch into pink punch, naturally.
I think this is so cool, and kids think this is pretty cool, too. Who doesn’t love magic, especially when it involves food? I set up this magical color-changing punch at a recent My Little Ponies theme birthday party. I prepared everything and Birthday Girl got to be the magician and impress all her friends by turning some blue punch into pink punch.
Birthday Girl had a blast making magic, and all the other kids were in awe of her color-changing skills. The best part of this food magic is that it is all natural. No artificial colors or food dyes here. The first secret to this magic trick is purple cabbage. Yep! Purple cabbage turns water blue. The second secret? Lemons! Acid turns purple cabbage pink.
Okay so let’s break it down. This isn’t really magic at all, it is science! Science is pretty stinkin’ cool, and food science is even cooler. Purple cabbage is purple because of something called flavenoids (the more science-y name is Anthocyanin). These flavenoids are molecules that turn plants purple, red, pink, and just about any color in that spectrum. You can also find purple cauliflower at fancy stores and farmer’s markets, and guess what? That purple cauliflower is purple for the same reason as purple cabbage. That’s right: anthocyanins! See? Isn’t science fun?!
Anthocyanins are affected by acids in the environment. We can force this interaction by purposely introducing an acid to the purple plant. In this case, our acid is lemon juice (because really our punch is lemonade). You can also do this color change trick on purple cauliflower. Steam some purple cauliflower and then squeeze a bit of lemon juice on it, and voila! You’ll have a cool pattern of pinks and purples on your side dish for dinner that night.
What is actually being affected when you introduce an acid to a purple plant is something called the pH level. A quick Google search informs me that pH is an abbreviation for “potential hydrogen” and that a pH level is the measure of a solution’s hydrogen-ion concentration. Well I’m no scientist, and that was a lot of scientist lingo up there. I don’t quite understand it all. I really should take that food science class I’ve been eyeing. Then you all would have to call me Miss Scientist Chef Sarah E. Has a nice ring to it, huh?
Anyway, I may not understand all the science behind this magical color-changing punch, but I do understand that it is a super cool and fun show for kids of all ages at birthday parties. Or just at home on a weekend when you’re in the mood for a little food fun. And really, who isn’t in the mood for some food fun? Also, it is so easy to do!
- 1 head purple cabbage, roughly chopped
- 2 cups water
- 1 pitcher of your favorite lemonade
- Place the chopped cabbage in a strainer over a large heat-proof bowl.
- Bring the water to a boil, then pour over the cabbage. The water will now be tinted blue from the cabbage. Let cool until you're ready to perform your magic.
- Pour the blue water into a large clear pitcher, or into several small clear cups.
- Pour the lemonade into the blue water and watch as it magically turns bright pink!