Here’s an example.
The photo was taken in 1956 and the slide has a heavy cast as can be seen at left above. Framed between to layers of fairly thick glass, the slide has been well protected, but some changes that look like they have crept inwards from the edges show up. I remember the slide being underexposed and some additional adjustments could improve the overall appearance. With all the details hidden in the shadows, the slide could probably profit from exposure bracketing HDR.
Can’t say what the film was, I’d have to open the frame for that - and I’m not inclined to do so.