you can see the mould, mostly happens when you dip other knives that have been with anything else -(that doesnt make sense) :S sorry, like when you put your knife in butter and then in jam, thats when mould will grow. its like whity greeny colour. and plus it doesnt smelll right. :))
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The smell is the first and best indicator that seafood has gone bad. It usually smells of ammonia. A very strong fishy smell isn't good, either.