To celebrate All Hallow’s Eve we’re reposting one of our favorite Halloween articles:
Happy Halloween everyone!
In honor of this spooky holiday, we’re going to tell you about a demonstration of a scientific principle that not only make for a good Halloween trick, but it also has application in beauty science.
Water to blood
The trick is to change the color of water to red and then back again to colorless. You can learn everything you need to know to do this trick yourself About.com, but here’s the quick explanation of how it works.
Certain compounds act as pH indicators which means they change color depending on the pH. For example, phenolphthalein turns red at a certain pH range. So, if you take two glasses of water with the right pH and add Phenolphthalein to one, you can pour them back and forth and turn the water from clear to red and red to clear again. Cool huh?
Smashing color change
It also so happens that some color changing cosmetics use this same pH reaction. For example, Smashbox Oglow blush turns red by using this same principle. It’s Boo-tiful science!