Has Tony been searching the NAA web site ?
I have . This late 1942 document is revealing to say the least .
In effect ,the paint manufacturers are saying to the Govt. Even if we share our paint formulas , there is no guarantee the outcome will be a standard colour
I hope the link works .
https://recordsearch.naa.gov.au/Sear...367640&T=P&S=7
more info
https://recordsearch.naa.gov.au/Sear...aspx?B=3367640