What color is trim on Raven guard shoulder pads in Warhammer 40000?

According to Index Astartes IV the trim should be the following:

Left Shoulder: Black

Right Shoulder: Depends on Squad Type (see below)

Tactical - Green

Assault - Red

Devastator - Yellow

Veteran - Black

Some commanders / high ranking veterans have all white shoulders (as well as helmets and sometimes arms).

Note: The current Codex: SM (5th edition) depicts Raven Guard trim painted with company colors (namely red, for third company). This is believed to be wrong by much of the fan base as it goes against established fluff / lore.