Anulus color on 7.92 Besa


Is the Anulus color on 7.92 Besa what determines the type of loading ?
For example I have Red anulus Besa in my collection and have read in this forum that Red anulus denotes a Tracer.
What does a Black or Green anulus indicate /


Handbook of Ammunition, 1945; Britain

A couple of web pages with additional info which may be of interest-