How stupid was that 5 marker? i hardly think that the 'relationship' between colour and chemisty is worth that much. i just bollocks about different pigments and their qualities, such as insolubiblity.
Believe me, there was plenty to talk about such as the uses of the pigments, why the pigments were suitable etc, etc, I managed 2 fill up a couple of pages! Most of it was waffle though!