Tin rust??

[Bostoneo]

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[ak2000]

It's not uncommon. I'm assuming tins are made out of very cheap metal.

 

[Bostoneo]

It's not uncommon. I'm assuming tins are made out of very cheap metal.

assuming I should open these and jar em?

 

[Sweemzander]

looks like its only on the outside
Rust on the inside is what you need to worry about, but I doubt that is the case here unless the seal was compromised

 

[BloodWood]

No need to jar if vacuum is sound.

Metal + Oxygen = Rust/Oxidation
Vacuum = Oxygen Free

Oxygen Free + Metal = No Rust

 

[ak2000]

What Dan and Brad said