Final answer:
Historical records do not provide specific details about the color of a king's throne inside the enormous El Castillo pyramid at Chichen Itza, as it served as a temple rather than a royal residence.
Step-by-step explanation:
The throne's color inside El Castillo, a massive and enormous pyramid at Chichen Itza, is not documented with specific colors related to the king's throne within historical sources available. El Castillo served as a temple for the god Kukulkan and doesn't contain a traditional throne as might be imagined in a European context. Historical and archaeological records of the site provide no evidence of the throne’s color or existence, focusing instead on the architectural and astronomical significance of the pyramid structure itself.