Solving the mystery of red quarters: why are some coins painted red?

Have you ever received a quarter in change and noticed it had a peculiar red tint or paint on it? These "red quarters" have been circulating for decades, often leaving people scratching their heads about their origins and purpose.

The most common explanations for red quarters are that they were used for testing coin-operated machines, as "house money" for free plays in businesses, or for free laundry in apartment buildings. — Read the rest

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