How Toothpaste Got Its Stripes

How Toothpaste Got Its Stripes

If you always assumed striped toothpaste was the work of a magic devil, assume again. It turns out it’s the work of a little extended pipe inside the tube that merges the different colored substances onto the toothpaste highway and straight onto your brush. That mechanical trick is half a century old, however; modern varieties sometimes just come that way, as this frozen toothpaste photo that’s been around for a while demonstrates.