It is hard to see the one in the milk. We didn't open the jar because the milk was bad. 1 (milk) & 3 (water) were unaffected. The next, least effect was sugar free lemonade. Squash had changed the colour of the shell, lemonade had begun to take off the surface of the shell and the shell was brittle. Vinegar had completely dissolved the shell so that only the thin inner membrane was left. Everyone now has a good understanding of how teeth can be damaged by various liquids (and foods).
The children really enjoyed this investigation and had lots of ideas about what other liquids they could test. Maybe you could try some at home?
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