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What goes in the water red, and comes out black?

Answer: iron

More Difficult Riddles with answers

Previous: What goes around and around the wood, but never goes into the wood?

Next: What goes in, but never through? I've got some and so do you. We might lend one, or even two, but only if our trust is true.

More Difficult Riddles

What goes in, but never through? I've got some and so do you. We might lend one, or even two, but only if our trust is true.
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What hangs others yet can unintentionally hang itself?
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What has 4 legs in the morning, 2 legs in the evening and 3 legs in the night?
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What has a big mouth, yet never speaks?
What has a bottom right at the top?
What has a mouth but can't chew?
What has a spot and is very bright, is sometimes, red, white, blue, yellow or green and is often blinding.

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