Mix Fluids

How do you fill a light fluid over a heavy fluid without mixing the two fluids?. ( Both fluids are miscible)?
Allow the light liquid to flow very slowly from a very fine tube. You will always get some mixing by diffusion, but it is possible to pour the liquid with minimal mixing. There is a drink called the Mai Tai where the bartender does this with two different colored but miscible liquids. She does it by using organic skill only.
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