Crazy the aluminum didn’t melt completely on the condenser coils.Between a new acetylene tank and one that was in my son's shop fire.
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Mine have always been silver. With a red hose on my torches. Black has been nitrogen.Always had black myself.I bet that was a fireball.
It must depend on the supplier. Never seen a red one.Our cutting torches have had red acetylene tanks for 50 years.