So after a week of looking into the colour sensor and tonal values of different colours it looks like it might be easier for the application side of things if I limit the colours that can be used so that the tonal value can be accurate to a certain degree.
The colours that I am deciding to use are Red, Blue, Yellow, Orange, Pink, Purple, Green & Brown.
These are the colours that most primary school children are used to and also know, because if you look at a colour wheel of primary, secondary and tertiary colours there are main different types of a child isn't exactly going to call chartreuse green by its name, the will most likely just call it light green.
The other reason for using these colours is to make the tonal values simplar to define. Even though if you scan in something that looks red but is closer to orange, the device will have a sequence to compare the colour to to make sure it gets the closest tonal value to the colour.
Below you can see an image of an extreme colour wheel labeling all the different colours. This is also the wheel I am using for my references for the colours.
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