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How does this work ?

Some time ago I found a clear plastic block (8cm.L x 8cm. W x 11cm. H) inside of which was an Edison screw cap light bulb. I thought it would fit rather nicely on the mantlepiece and cast it aside until I got round to decluttering same. Yesterday, being at a loose end I embarked upon decluttering and installed my find.
Last night, I noticed that the light bulb was glowing a dark blue colour. I was listening to the radio at the time and only had one wall lamp switched on so the room was relatively dark.
I am just intrigued has to what source of power is used to illuminate the bulb. It is totally enclosed in plastic and there isn’t one of those cell things that are used to power garden lights. The bulb itself appears to full of a white substance which resembles candle wax in appearance.
Any suggestions which would satisfy my curiosity would be appreciated.

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