What You Did
You discovered the relative density of various liquids.
The liquids should remain in striated layers
That said, you do need to be gentle as you pour one liquid onto another. With enough force, some liquids will blend together. Drink mixologists often use a spoon to help blunt the force of gravity to keep layers in their mixed drinks, so if you have trouble, try using a spoon.
This experiment is similar to Veggie Races. Can you observe...+ Which liquids are more dense than water? + Which are less dense? + What does that tell you about their relative densities?If you are extremely cautious and work with a knowledgeable adult, you might try other kinds of liquids, but you
striation, relative density