Multiple vertex colors, always copies first Col map

Support Materials and Textures
1

I want to paint multiple vertex color maps, in texture paint mode. But when I create a second Col.001 layer/map it always copies the first one and I have to manually paint over it, how can I get a new blank layer?

2

I found that you can press Shift-K to Set Vertex Colors, and this tool tip says it fills active vertex color layer with the current paint brush color.

3

That works, thank you.