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A bulb can turn black due to a few reasons, primarily related to overheating or a failure in the filament. When a bulb is subjected to excessive heat, the materials inside can degrade, leading to blackening from carbon deposits. Additionally, if a bulb burns out, the filament may break and burn, causing the inner surface to darken. In some cases, a poor electrical connection can also lead to overheating and discoloration.

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1w ago

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