This may be refreshing for some and old news for others. Almost all the photographic references of the ESB helmet show it to be very lightish green (the infamous pepto shown in exhibit photos) or bluish from the ESB stills/film. However, the actual colors are a lot darker than we have seen in most pics. And I think our perception of the helmet colors has been slightly askew due to the material we have.
Well, Brak's Buddy scanned a photo that I have been looking for awhile. It's a pic of the ESB Hero/AOSW helmet OUTDOORS at one of the SE's premiers, I believe.
Yes, natural lighting! Hope the pic helps those without access to an airbrush or to Panzer Olive Green (the 99.99 % correct color) to make their custom mixes more accurate.