Colorization - what was it's purpose?

[Rafal]

And I can only agree too. The used colors seem not to reflect reality but rather the paints available to the painter.
For example there is definitely too much blue:
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However removing the paint doesn't really help us much.

Okay, there are people like me, that nothing would help them   I just don't know how herbs and other stuff growing in the field look like and wouldn't recognize buckthorn, hemlock, goutweed or alehoof even if drawn in most realistic way. In case of many such plants I don't even know that they exist.

But there are people who are good at botany and are good at herbals and they cannot regognize Voynich plants too.