Heros the Spartan update

Crudely scanned by me to have some colour Bellamy on this page! Taken from Eagle 27 June 1964

I don't think there's any point in repeating the fact that Dave has written about the soon to be published Heros reprint book from Book Palace, so jump over there and read it yourself. Needless to say it should be fantastic especially with those gracious guys John Byrne, Dave Gibbons and Walt Simonson adding their tuppence-worth (that's 2 cents worth to you Yanks celebrating Independence Day!)

Whilst writing about Heros, here's a particularly odd piece of Bellamy trivia. This item appeared on eBay with a start date of 30 August 2004 and the descripion read:
Eagle comic art work glass negative for the 1960s strip Heros the Spartan, it's episode 1 and tells the story of his capture. It measures 22 inches by 18 inches and is in good condition

Glass negative of Heros the Spartan

I have never read an explanation of how the artwork was transformed into a printed product but am aware that an infra-red camera was used to separate colours. So is this the black separation? Can anyone fill me in on the detail as the size of this glass negative is larger than the published comic, but not much larger. The picture was the original eBay picture which I grabbed and stored at the time

If you happen to be the owner of this piece, do get in contact with me or Dave or Book Palace who I'm sure would be interested in seeing it and you could get a free copy of this top quality reprint as can anyone who owns some original Heros artwork and will let it be photographed/scanned.