When we went to the science road show at Channel College the man showed us an experiment where there were five cup and there was a liquid in the cups. He first had some water in a cup then he poured the water into another cup which seemed to be empty but the water changed into raspberry. Then he poured the raspberry into another cup and it turned back into water. He then turned the water into lemonade and then coke.
He said that it was a chemical change. He made it change from clear to red by using acid then he neutralised the acid to make it white again. Next he put baking soda into the cup to make it bubble then something else to make the liquid brown like coke.
It was really cool.