Liquid column

i think the biggest reason that something floats and something sinks, because some of them have higher density, but some to them have lower density. The higher the density is, the object sinks more. For example: the pink color liquid sinks the most because it is the most dense liquid. i think the reason that some of the object float in the middle of the bottle is because its density is between the top liquid and the bottom liquid, that's why it floats in the middle.
i don't think that it is going to separate on Monday, because some of the liquid inside is mixed , and it won't separate.