Caput Mortem (or Caput Mortuum, aka Mummy Brown or Dead Head) has legends about how it came to be.  It was likely made from the residue from the production of sulfuric acid.  The residue was colcothar.
Another legend says it was made from ground-up mummies, *ick*,
this process discontinued in the 19th century, thankfully.
I have found it ranges from the brown-purple paint on the left (preferred),
to the more common color on the right.
The color on the right doesn’t suit my mixing preferences.

I can’t believe this odd color I like so much is now made from a purple variety of hematite iron oxide (there is that hematite again,  a favorite pigment!)

I mixed Caput Mortem into many colors just to see how they mixed.
This play that also helps me learn!

In this mix for flesh tones I tried Potter’s Pink in place of the darker
Windsor Newton Caput Mortem, which I can’t quite like.
I like the flesh tone achieved.

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