Hey guys, I'm a newbie to straight razor shaving and looking for advice on stropping. I was sold on Dovo strop paste. It comes with two blocks; Red and Black. Is the red for the canvas strop and the black for the leather? The sales person wasn't very helpful...

I have two strops. One for daily use with a leather/linen strop, and then I have another strop that I was going to paste. What goes where??

Any help would be appreciated.