Hulsroy's Hustle

Colour for the MTB will be this Caput Mortuum. Slightly less red than initially planned, but I think that's a good move.

Caput mortuum (alternately called nigredo) signified a useless substance left over from a chemical operation such as sublimation and the epitome of decline and decay; alchemists represented this residue with a stylized human skull, a literal death's head.

The symbol shown on this page was also used in 18th-century chemistry to mean residue, remainder or residuum. Caput mortuum was also sometimes used to mean crocus metallorum, i.e. brownish-red metallic compounds such as crocus martis (ferrous sulfate), and crocus veneris (copper oxidule).

https://en.m.wikipedia.org/wiki/Caput_mortuum