DrDre said:

That could indeed have been true. The print coloring probably depended on the type of print stock that was used. The question of course is, whether the green shift was deliberate, or whether age causes the print to become slightly green shifted, and whether the original negative also had this green shift?

That is indeed the question. I am guessing that Mike is doing his work with the answer "no" in mind.

also: Ah! What a terrible time for screenshot comparison to be down. Can't see any of the last few posts worth of work!