Gulp! That's old! I bought a block of 2475 Recording film just after it was discontinued. It was a little oudated and pretty foggy when I got it, and within a few years was pretty much unuseable. I really don't know if there's any developer that'll rescue it. Best bet is something really 'clean' working like T-Max, but a clip-test would be my recommendation. Just keep your fingers crossed as it comes out of the soup.