Do Herbal A and Herbal B correspond to differences in imagery?

[Koen G]

Before writing the post, I checked the McCrone report again and the red is a red ochre. This is supposedly an extremely common mineral pigment. To give you an idea, this is what the cavemen painted all over their walls. From what I gather, it was known all around the world.

Still, it looks like for some reason the VM did not always have it available, or maybe their ochre turned out more brown than red sometimes, prompting them to use if only minimally.