Here is a section where we can post the Munsell notations of various paints. If a paint doesn't match a chip exactly, then try to guess its notation. For example, yellow ochre might fall in between 10 YR and 2.5 Y. Maybe. Its value is usually 5 and the chroma around 6. One could write 10YR-2.5YR 5/6. Or, one could guess 1 Y or 2 Y etc. If the value is slightly higher one could write 5 + or , if less 5-. The same goes with the chroma, guess or give a range.
Also, I would like information on the loss of chroma and the change in hue when a paint is mixed with white.