Having dark hair and marrying someone with light hair wouldn't necessarily give your child an intermediate hair color. Sometimes children have genes that are codominant and sometimes the dominant genes shows in the phenotype. It really just depends.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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