thought she had an answer because it has something to do with "colors". Although I'm not sure why it is there, the string is not unlike printer values for color separation.

"5M" 5% Magenta
"15Y" 15% Yellow
"40K" 40% Black.

Sure seems that magenta, yellow and black can be mixed to give the colors present on the chip.

But I could be wrong! I too like that CC & GTCC chip!

Jim