3rd Raikage has blood like iron, so his inner parts are also very durable. Blood is far less durable than ordinary organs so it being solid in 3rd Raikage's body is a testament to how strong his innards areI might be mistaken. However, aren't they literally breathing in the mist which in fact contains acid? Wouldn't it be affecting him from the inside and not just the outer?
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Yes but the difference here is that the factor by which 3rd Raikage is more durable than ordinary metal, say Samurai armour, which withstood amaterasu, is greater than the acid used by these girls compared to real life acids.Couldnt the same be said for the acids used in NV?