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Is the white powder on the inside of light bulbs poisonous?

My 2 year old is FOREVER getting into stuff and I threw away a light bulb and he got it out of the trash and busted it. I found the white powder on his fingers and hope and pray he didn't injest it. He says no, but I still want to know. I have always herad it was poisonous. PLEASE HELP!!

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Are you talking about incandescent (traditional) light bulbs or fluorescent light bulbs? Fluorescents do contain a very small amount of mercury, which can be toxic, especially to young children. However, if you are talking about a regular incandescent light bulb that happens to be frosted on the inside, then there should be little cause for concern.

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