Science Experiment: Indicators

In this experiment we made an indicator, by chopping red cabbage and leaving it in hot water for 30 minutes. Then we put the mixture through a sieve to take out the cabbage. The liquid was dark purple.

We poured a small amount of the indicator into small glasses.
The substance we were going to test were lime juice, vinegar, tonic water and shampoo, but the shampoo stayed purple.We also tried bleach and stain remover.

The lime juice, the tonic water and the vinegar changed the indicator to red, this means that they were acidic.
The bleach started purple but then after a few stirs it went blue, orange and then yellow! That was weird!

When we tested the stain remover it went completely blue, which indicates that it was alkaline.

It was interesting to see that different liquids can be acidic or alkaline, and that they change the indicator different colours.