I am responding to Black Sheep's request although really it is the wrong forum and this will be a two post job.
First of all I own some 80 German WWII vehicles including Panther, Tiger I, Tiger II, Jagdpanther, softskins etc. Most of these are awaiting restoration to full operational status.
This means that we have to go back in time to the original chipsets and colours used As these vehicles have spent the majority of their time under the water and in thick mud then the paint has not had the chance to age in any way which means that correct paint samples can be collected from each vehicle and sent away for colour and other analasys etc.
Once this has been done we can then compare them to actual chipset samples held in official German archives. During one session we came across a letter to all the paint companies (a list of the companies too) from OKW (German High Command) Thanking them for keeping all the colours manufactured with a 10% tolorance of the chipset colour. This is remarkable considering they were being bombed by the RAF at night and the USAAF by day which caused total disruption!
I contacted a paint company who is still trading and was on the list and asked if it would be possible to have access to their archives and gave the reason that were were searching for a provider that could make original versions of RAL 7028 as that actually changed colour 4 times in the war, not shade wise, but ACTUAL colour.
On a visit to the factory and while in their archives we produced our actual samples from the vehicle and was able to match them to their own production samples which amazed the Managing Director who began to get very interested in what we do.
We now have a conract with them to provide us with modern remake of the authentic paints. We can't have lead in them amymore etc, so they provide us with industrial acrylic paints which I can use in my airbrush!
The photo above is the original paints from the company that we put on our vehicles.
The top row from left is RAL 6003 Green and the rest on that row is Afrika Korps colours.
The bottom row from left is RAL 7028 Dunkelgelb in order of usage. THe first on the left is Dunkelgelm Nach Muster (Dark Yellow After Pattern). This was only used from February to August 1943 during the Kursk offensive (Operation Citadel). RAL 7028 was the number that OKW had applied to the RAL people but after feedback and complaints from soldiers at the front what actually went in to the RAL catalalogue as 7028 was the colour 2nd from left!
The next colour third from left came into use in May 1944 and was seen as the base coat of new vehicles etc in the D-Day landings and the last one (4th from left) was trialed during Operation Panzerfaust in Budapest by Tiger II tanks from the 503rd Heavy tank Batallion and came into useage Christmas 1944 /January 1945 when the base coat became RAL6003 Green.
I will produce chipsets of AK's Real Colour set of RAL 7028 and you can see how much difference there is between reality and fiction or lack of research.