It contains little tiny blue bits that spread dye. When you squeeze out the tooth paste it is white but as you brush little tiny blue bits spread dye through the toothpaste to make it blue when you spit it out.
The problem is these tiny blue bits get everywhere. I have to clean the sink after brushing my teeth. They get on your fingers, on the towels all over the place. If you try to wash them off they just spread.
It’s driving me to distraction.