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hankronA piece of sage advice when making big accusations is to say "In my opinion" or "It is my opinion that such-and-such is fake." It is not libel if you are saying something is an opinion. It can be libel if you incorrectly say something is fact ("It is a forgery.")
Also, when you realize you've made a big boo boo in judgement, be the first and never the last to admit it.