I was recently asked by one of the restorers what the likely colour scheme was for a 7.7cm Feldkanone 96 n.A. They attempted unsuccessfully to find out where this gun was deployed.
This gun was captured in 1918 on the Western Front, possibly by Australian troops. The gun (serial #2715) was a reworked 96 a.A - the dates on the breech and carriage are 1907.
My best guess is that Feldgrau is a reasonably colour for the gun since it may have been one which was in second line duties for much of the War but deployed in the front line in the German offensive of 1918 - the FK96s were lighter and more mobile than the successor FK 16.
I've attached a couple of images of the gun - it appears to have been a single colour in 1922.
If the restorers want to use similar color schemes than the ones that could have been on the gun during its capture, they might as well use a multicolor scheme.
The advantage is that there is, in France, a surving FK96 in the museum of Perigueux that still has its original paint scheme :
It looks like the camouflage colour patches were applied over a base colour of Feldgrau on the Perigueux gun. There seems to be a mixture of sprayed on and brush applied patches - I suspect the brushed on patches might be later "restorations".
In the recent Tankograd A7V book by Hundleby and Strasheim they suggest the German camouflage paints (on the A7Vs at least) were captured stocks of pre-war Belgium Railway colours. If so, this makes matching the colours a lot easier since these colours hardly changed over decades.
Another question from the restorers of the Corinda FK96....
Did WW1 German guns carry divisional or unit symbols? There do not seem to be any on the surviving guns where they haven't been repainted like the guns in the Brussels museum or the FK96 above.