I have a pollen trap and have used it with rape. I also have a copy of this book and I can agree with your comments that the colors in some cases just dont match.
I think its a bit like car paint, the spray can for your exact match can be slightly off, same with household paint strips - they seldom match exactly and same with printing colors on an inkjet the colors can be off. Go into a TV shop and look at the screens, the colors will be different for the same channels all streamed from the same source even for two identical TV models.
I suppose that's life
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