Principal English Translation:
a dark purple color (see Molina)
Alonso de Molina:
camopaltic. color morado escuro.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 12r. col. 2. Thanks to Joe Campbell for providing the transcription.
Attestations from sources in English:
camopaltic = violet (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 3 -- The Origin of the Gods, Part IV, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1978), 14.
Attestations from sources in Spanish:
Camopaltic = Morado
Antonio Vázquez Gastelu, Arte de lengua mexicana (Puebla de los Angeles, México: Imprenta Nueva de Diego Fernández de León, 1689), 32r.