Blackburn Roc undersurface colour?

[GrahamB]

Hi,

Skua and Roc colours have exercised the minds of many over the years, and the articles by Ian Huntley in Scale Aircraft Modelling remain the best accounts. The well known series of photos of an echelon of Rocs includes two in Matthew Willis' Mushroom Model Publications book, pages 71 and 72. Dated August 1940, the photo on page 72 shows five aircraft with the second, fourth and fifth with a dark-coloured undersurface - of similar tone to the roundel blue. The other two have pale undersurfaces, presumably Sky Grey or Sky.

Does anyone have an informed opinion of the likely colour for these aircraft? Would Trainer Yellow give this result with the print type or are we looking at something like Light Mediterranean Blue?

Thanks.

Cheers

GrahamB