Here are some results of solutions tested with universal indicator paper:
| Sulphuric acid | Red |
| Metal polish | Dark Blue |
| Washing-up liquid | Yellow |
| Milk of magnesia | Light Blue |
| Over cleaner | Purple |
| Car battery acid | Pink |
Arrange the solutions in order of their increasing pH values (starting with the one with the lowest pH).
The solutions have been arranged in the increasing order of their pH values are given below:
Sulphuric acid (pH 1) < Car battery acid (pH 2) < Washing-up liquid (pH 5) < Milk of magnesia (pH 9) < Metal polish (pH 12) < Oven cleaner (pH 14)
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