Really appreciate the PC-10 formula. I think your custom color looks very scale and has the right hue.

FWIW from a UK site a while back: poss Dan San Abbott ( quote not sure)

"In Its earliest form PC10 was a mixture of 17 parts yellow Ocher to which 1 part of lamp black was added by weight of dry pigment. This was mixed with either a cellulose acetate an oil varnish or some other glossy liquid medium, giving the finished coat a tendency to look slightly green under certain conditions. Ex-works aeroplanes could therefore tend toward a greenish-brown shade-though still predominately brown-but after the machine was in service for awhile the effective color was a positive brown.