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Why does Frodo become invisible?

Why does Frodo become invisible?

As we all know when Frodo slips on the one ring he disappears from sight, but why does Frodo become invisible?

Why does Frodo’s sword glow blue?

Why does Frodo’s sword glow blue?

Frodo's sword, sting, glows Blue. But why does Frodo's sword glow blue? What gives it this magical property?