The physics of why your toothpaste stripes stay separate

Why Don't the Colors in Toothpaste Mix Together? · 8:01 · Video: History of Simple Things · Watch at the source

In short: Ever wonder why toothpaste colors don't immediately bleed into one another? This video explores the chemistry and history behind this common bathroom staple, explaining how specific ingredients allow distinct textures and colors to flow together without mixing.

The video examines the science of fluid dynamics and ingredient composition that prevents color separation in toothpaste. It also looks into the historical development of the product's unique texture.

Beyond the physics, the content clarifies what those small colored marks on the tubes actually signify and whether they correlate to specific internal ingredients.

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