Why do foreign objects and debris (e.g. match pieces, wick pieces, insects) have to be kept away from the wax pool?
Foreign objects soil the wax, which clogs the wick. The absorptive capacity of the wick might be reduced. Foreign objects can also catch fire and act as a second wick then. As a result his second flame may destroy the candle. This might especially be the case when the foreign matter is at the edge of the candle. The candle edge is breached and the candle keeps on running.
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