old color photos

[christo]

I have a large number (3000+) of color photos from the 50' and 60's that have become yellowed with age. I also have a number of photos from the 70's that seem to have a reddish cast to them. I need a quick means of correcting these. Does any one know of a good tutorial/atn that I can use?
Thanks

[LadynRed]

A lot of those types of color casts can be fairly easily corrected with levels adjustment layers. I've got lots of the same era with the same problem and I"d say about 80% of them come out looking great with just 1 levels adjustment.