My Scientific Question:Which substances are hydrophobic’s and hydrophilic’s?How do we determine them?

What I did: I used 4 different kinds of substances (rubbing alcohol, toothpaste, hand soap and dish soap) to determine which are hydrophobic and which are hydrophilic when placed in a bowl of milk and 1 drop of food dye. Time was used to determine whether they were hydrophobic or hydrophilic to figure out what kinds of other substances are similar to them.

What I found: I found out that the more time it takes for the dye to reach the end of the testing sterile dish when using one of the substances, the more hydrophilic it was and that the substance wants to interact strongly with the dye, for example the toothpaste and rubbing alcohol. Also, I found out that the less time it takes for the dye to reach the end of the dish, the more hydrophobic it was and did not react with the water at all. Some of the hydrophobic substances were determined to be hand soap and dish soap while the hydrophilic substances were rubbing alcohol and toothpaste.