ruberythrinic acid (English) comes from Latin ruber, from Proto-Italic ruðros, from Proto-Indo-European h₁rudʰrós, from Proto-Indo-European h₁rewdʰ- — red.
ruberythrinic acid (English): An acid extracted from madder root; a yellow...
red approximately like red ochre (which had a traditional status among the Romans); red that was both common and dignified, somewhat associated with pigment