Delta film base vs tmy base

[D. Bryant]

The Delta 100 looks to have a rather huge amount of B+F. One assumes this is from age, but it could also be from bad (hot) storage conditions. I would say toss it.

Sandy King

I agree with Sandy. I had some bulk loads of 400 Delta some years back that became fogged just as your scan shows.

Don

[Vlad Soare]

That's fog, all right. My money is on heat, too. I have developed negatives exposed 25 years ago with results ranging from very good to excellent. On the other hand, I once got fog as bad as yours on a negative that had just been bought and wasn't even near its expiration date. Who knows how it had been stored in the shop...
Though I don't have solid data to support this, I believe that storage under hot conditions does much more damage to a film than age does.