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Popular in the first half of the 20th century, violet ray machines used high-voltage, high-frequency, low-current electricity for supposed electrotherapy. The machines generated a violet glow from a gas-filled glass electrode and a small amount of ozone. Manufacturers claimed that these machines could cure all manner of human ailments, including hysteria, arthritis, gout, hemorrhoids, brain fog, gray hair, tooth ache, and wrinkles.