mister me,
The colours on Belfast have been discussed on-line in the past. As I recall it the story goes something like this:
At the time the Warship Profile booklets were being produced in the early 1970�s a genuine original wartime camouflage design sheet was said to have been knocking about the Windsor offices of the publishers. This design sheet was said to be the source for the centre-spread colour illustration in the Warship Profile 29 softcover booklet and in the hardcover Profile Book No.4. They give the colours as 507A, B5, B6, 507C. These are the same colours that Alan Raven suggests in Volume 2 of his Warship Perspectives booklet published in 2001. Alan says he himself once had this design sheet but lost it in some house move.
(Alan Raven does read these boards from time to time (or friends of his do and can prompt him to look) and he may be able to provide additional information.)
The interesting thing is that both of the Profile illustrations depict the starboard central dark grey camouflage panel incorrectly with the area forward of the gash shute switched to a lightish blue at a vertical line. Likewise the torpedo bulge forward is shown as a lighter colour rather than being the same as the dark grey curved panel extending down from A turret. It does make you wonder.
Raven depicts these camouflage panels correctly in his booklet.
Both Profile and Raven are depicting the original 1942-43 scheme in the MS&B paints era. Looking at the (small number of) photos I have from that time, their 507A, B5, B6, 507C colour callout seems to me understandable for that time.
However your photo shows Belfast in June 1944. This is during the B&G series paints era (13 May 1943 onwards). At some point she would have done a complete repaint into the new paints. It looks to me from the very few photos I have of her late 1943-44 that the tone of one or two camouflage panels was significantly changed. Most obviously the waterline panel on the portside below the bridge goes from being the second lightest tone in the 1942 scheme
Belfast gcd Oct 42 - Copy.jpg
to the darkest tone in the 1944 scheme as shown in your photo. So it is perhaps possible that at the time of a repaint there was a rethink and some G5 was introduced.
Strangely there seem to be very few photos of Belfast 1942/43 and 1943/44 in her disruptive schemes which makes judging what was going on very difficult. I think we would need many, many more photos from both eras to come to any reliable conclusions.