that's what Kodachrome was like. In the '50s there were few choices for color film, and Kodachrome was better for landscapes than for portraits.
I think you may have missed the point Dan.
In another picture, Elbert had purple ink on his finger, hence the Barney reference
The guitar Paul played early on was a Rex, but not in that picture: Hohners were very popular (cheap and available) at the time in England, and were the makers of Pauls Violin Basshttp://www.pbase.com/crumblebum/rex58
I don't think it would be a Gibson at that stage of their careers due to cost and the fact that it was latter replaced by the "Rex"