Anyway - CiM Auburn looks like an opaque red - but ...
In cool light (fluorescent), Auburn looks like a brown - a dark brown. In this photo - it looks black even, but I didn't colour correct - so that you can see the contrast.
And here is the same rod end - under a nice, hot incandescent light bulb.
This is a thin layer of Auburn over a clear core. Looky - it appears to be transparent - if used thin enough. It is also cracked, but I think that was me - paying more attention to the other beads on the mandrel.
And here we have the same bead on the other side - a desert at sunset look.
Where it was very thin on the last bead - I did get it hot enough to lose it's colour, but it struck back to red easily. There are some interesting orangey effects/areas - I think this is sort of a bleeding effect - the red actually spread out more than I thought it did and covered some of the ivory in a very thin layer.