I would have to look at the invoice again, or maybe the start of this thread would have what color the chip was. I don't recall off the top of my head.
If it was based off the colors used for the standard mockups (& sample sets), I believe those were canary yellow (the samples were 44 mm though). This is going to be a neat group buy to watch, I think we'll see a number of different color variations on the higher denoms and fractionals. We should really start a separate pron thread.