The dates when this engine was repainted, and the colours used, are all on record, thus:
When it was new, it was light green; in January 1938, blue; in February 1943 (wartime), black; in August 1946, blue. The blue was the light LNER shade called 'garter blue'.
Then under BR it was painted a purplish-blue in June 1948; in August 1950, dark blue, and in March 1952, dark GWR green, which (sadly, in my opinion) it retained until it was scrapped in 1966.
Harry.