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Hamlet is in mourning over his father's death hence the black garb. Hamlet tells mother that unlike others who merely pretend to mourn his father, he (Hamlet) is actually the real thing. Hamlet describes his uncle as a pale imitation to the king, "My father's brother, but no more like my father. Than I to Hercules..."
Hamlet pretty much calls Gertude and Claudius an incestuous union. I think Hamlet goes a little heavy on the "my mother is a whore" thing but then again, Hamlet really liked his mother!