As well as the sugars in the plants there are glucides polysaccharides like the starch, the substance that will be obtained from the pulp. That substance is the reserve of a lot of the plants.
1- To obtain a sample to compair with, we will take a potato, that is rich in starch. After chopping the potato by the middle and to cut it, we throw some drops of lugol. That colouring dyes purple the starch.
2- We take now an olive, we take off the pulp and we mince it.
3- When the pulp of the olive is minced, we throw some drops of lugol.
4- Conclusions: we can't see very well the purple colour because the olive pulp is too dark. But it is rich in starch, so it colours.
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