Yep. In East Asia in contrast, purple was not a royal color probably because it was not as rare. Beginning in the Zhou Dynasty, the kingdoms of the region had learned to produce synthetic purple & synthetic blue called "Han purple" and "Han blue" through a combination of mixing and/or melting different ores together. The Qin Terra Cotta soldiers had their some parts of their armor painted with some purple and blue colors. By the time the synthetic dyes were no longer as common, the culture(s) at that point had already associated other colors with royalty.