Ref the rear fuselage band on the Grottaglie VV, your question was answered in
2012 by Franek of all people, Danny. Scary how all our ramblings can be retrieved by the search engines now! It seems it was (or should have been) Duck Egg blue (ie Sky type S, as were the day fighter undersides) and was mostly removed in early 1945 from 2nd TAF a/c when good ground camouflage was deemed more vital than possible mis-ident, in progressively Luftwaffe free skies (that had one last trick up its sleeve of course). Interestingly it persevered in Italy, though on a varying basis. Like all paint schemes it was always liable to local mod.
Aviation historians may ponder in future about red triangles appearing on the fins of FEAF Hastings in place of the standard red diamonds of that fleet. They appeared because armed with brushes and red paint we were sent down to the 48Sqn first line by the boss. To enable the mod we borrowed a set of giraffe steps and worked our way down the flight line of the Changi Western Dispersal extending the one shape into the other. The Red Triangle was of course the 48 Squadron Badge, aka the Bass symbol.
Franek:-
The band was introduced to avoid friendly fire incidents and improve air to air recognition, it was remo0ved or not applied where it could compromise the aircraft on the ground.
White band on rear fuselage