Black light bulbs are designed to emit ultraviolet light. These light bulbs actually emit a lot of light, however it is not detectable by the human eye. Some materials like clothing appear to glow white under black lights or ultraviolet lights of any kind. These materials absorb ultraviolet light and then re-emit that light at frequencies low enough that our eyes can detect it. Technically any color can do this as it is simply the translation of invisible ultraviolet light into easy to see color...
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