Several years ago, I tried an experiment with blending Copic marker refill kits using a CYMK setup, to see if I could synthesize any color I needed. It almost worked, but two of the colors blended poorly and were mostly hydrophobic to one another.

At the time, I at-Copiced the experiment on birdsite. They reshared the idea and seemed vaguely interested, but it didn't go much beyond that.

Well. Someone internally seems to have taken the idea and made official Copic kits around it now, which is super exciting, especially if it was because of an experiment and a few dumb tweets.

Looks like they built two blending kits that succeeded:

1. Pale Celestine (B0000) for Cyan, Yellow Flourite (Y0000) for Yellow, Pale Pink (RV10) for Magenta, and two key colors up or down (Colorless Blender 0 and Neutral Gray N1).

2. Two flavors of each of Cyan, Yellow, and Magenta: Frost Blue + Tahilian Blue (B00 and B04), Lemon Yellow + Napoli Yellow (Y13 + Y19), Bougainvillaea + Strong Red (R43 + R46), without key.

Even though it's coming from an otherwise faceless corporation, it's cool that someone, somewhere built and shipped this concept.