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.
How Toothpaste Got Its Stripes
By cwalters August 7, 2009
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