So, why not make it? Many have experimented with emulsion paint of one sort or another and there have been attempts to make a compressed powder block (which was somewhat short-lived). However, paint methods have not been well documented nor been reproducible by all.
However, the ingenious soul who thought that Tarrago shoe cream might be a consistent and reproducible solution needs congratulating! Currently listed here are methods for recreating 103, 97, KG3 and RAF Blue-Grey.
Photo: David Pratt