When you squirt toothpaste how has it got neat coloured stripes on it? Surely in the tube it would all get mushed up?
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One solution is to have the toothpaste separated into quadrants containing alternating colors, and it will kinda look striped.
Other solution is to have an outer container and an inner one. The inner one contains the white paste, while the outer one contains the material with the stripe. The the stripe is added in the tube neck through small holes.
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