Burgundy to be sure!
The nice thing about the ICBN Cultivar prerequisite for a real honest to god photo (unlike the prerequisites for publishing taxa at a higher level like species) really clarifies the published description very adequately. Thats the simple beauty of the system, what it looks like is what it is.
If you want to really nail a particular form as your own, look for something yours has that is unique, and not just color. Other growers in theory could produce your "William's Red", but identical plants would be unlikely. Yours will have something no other similar forms may have, an inevitable expression of individual variation. The trick is to be able to grasp that difference and be able to describe it. That way your name applies only to your own production of "William's Red". The color may not be enough to do this, but a consistent expression like the shape of the lid or length of the tendril very well might.