Milk investigation: "When we poured in the food colouring, it went into little blobs and drained down into the milk and stained it green. There were no little 'explosions' of colour like before."
Cold water investigation: "This was quite a lot different. We think that the cold water was less dense than the hot water so the food colouring fell through the water more quickly than the first investigation. The blobs also started coming back up again."
Fizzy water investigation: "It looked a bit like the original investigation (warm water) except there was about a 2 second delay before the blobs sank. Also some of the bobs of food colouring stuck to the bottom of the jar."