Still working on my 72nd Albatros D.IV scratch-build with it's three bladed prop and I seem to recall that German experimental propellers had a red and white band marking on the blades?
I thought this would be a nice detail to add, but having looked through my references I can't find the picture I remember which was on an Aviatik I think

- Is there something confirming this or is it just my imagination?
Thanks
Paul
Albtros DIV propeller by
Paul S, on Flickr