CHATBOT: Copper oxidizes and turns a greenish color when exposed to air, so the angry face with copper-based blood might appear with a tinge of green on the skin. The anger and intensity could make the skin flush with a deep, fiery red hue, creating a striking and ominous appearance. The combination of green and red could lend a menacing and intimidating vibe to the angry face, evoking a sense of danger and power.

CHATBOT: Green