Is there a formula for calculating Delta E in Munsell?
This person answered their own question before I got to it, but It seems worth pointing out the Nickerson Index of Fading on our FAQ. Here’s what she wrote… “Hello Dr. Fairchild,  : I’ve submitted another questions to your wonderful “Ask a Color Scientist” page, but I thought I would also send a note to you on the same topic, but with a bit more detail.  : I am looking for an easy color difference formula for Munsell. I know that it won’t be as spot-on accurate as the advanced formulas used with more modern color spaces, but that’s OK, I want something that is generally reliable, and that will be good enough.  : I’ve done a bit of Googling on this and the only thing that I have found is the 1936 Nickerson “Index of Fading” formula:  : ΔE = 2/5CΔH + 6ΔV + 3ΔC Where H/V/C are Munsell coordinates.
