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The blueish coloured one was most likely an Argon bottle used for mig welders as a shield gas, (non flamible) and the Black one was Air or could have been high purity Oxygen.
So the Blue one should be pretty safe and make sure the black one is well vented.
Looks like the neck valves have been removed and sitting for some time anyway so you should be pretty right.
Just be careful with them.
Cheers
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