Isolating the colours

Hmmm. Where intersections of greenredorangeblue with upper yellowviolet at second case?

*internally screaming*

How?

Just to be clear, I’m angry

Where is this from? I'd love to understand how this works

This seems impossible.
The coloured pencils underneath it would still have missing sections where the other pencils crossed over as, even though the light was blocked, the material there blocking it would not be invisible.

I beg your pardon?!!