Not the royal purple it sounds like, but the grey of a bruise.
Purpura is a neutral grey.
It can be described as neutral, medium, colorless and almost grey.
Set in black, because black reads best on it.
Purpura is a condition of red or purple discolored spots on the skin that do not blanch on applying pressure. The spots are caused by bleeding underneath the skin secondary to platelet disorders, vascular disorders, coagulation disorders, or other causes. They measure 3–10 mm, whereas petechiae measure less than 3 mm, and ecchymoses greater than 1 cm.
Read on WikipediaPurpura is a genus of sea snails, marine gastropod mollusks in the subfamily Rapaninae of the family Muricidae, the murex snails or rock snails.
Read on WikipediaProper noun
Proper noun