Let me put it this way. What you have is salt, and sodium nitrite. These chemical compounds are stable. Heck, if you could find some 1000 yrs old.... still good, they don't change. Now, the pink colour that is added is a vegetable dye. It can change, but that doesn't matter because the salt doesn't allow bacteria to grow, that's why we use it as a cure. Look, if you're not comfortable... toss it. You have a choice. You came here and asked for advice.
Oh wait, you weren't the one asking. Sorry, my bad.