Weird one ... Decided to change my strings on my electric. Les Paul copy that I rarely play.. by play I mess about at home.
Anyway clearing out stuff I found an unopened set of Ernie Ball super slinkeys. Probably bought them about 5-6 years ago. The E and A strings have rust / oxidisation on them. Thought it strange considering the other 4 strings are fine. Maybe if they were on the guitar and became rusted it'd be normal but the outer pack was sealed. This common for older sets or strings ??
Will just get a new set either way