I'm sorry, but learn to google
Both are right, but in aquafresh, when only colored pastes appeared it was like this:
Architect Max Kuchinsky clearly smoked something.
What markers? Everyone knows that there gnomes sit in a tube and paint paste with small brushes.
Because mixing requires space and low viscosity. Inside the tube of "striped" toothpaste is a ready-made striped "sausage" paste. Since the toothpaste is viscous, its outflow from the hole is laminar and no mixing conditions arise. You can verify this by simply donating one tube of such a paste, cutting it and looking at it.
Because the toothpaste in the tube is only one color. When extruded, it is colored with colored markers sitting right at the exit of the tube, on the segment on which the cap is usually screwed.