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Some candles have scents that last only a little while after lit, and others are scented until the candle is literally burned out.

I would like to make candles, but I know some have stronger, more lasting scents than others. What ingredient(s) do I use to make a candle that it extremely fragrant (like the expensive ones at the Yankee Candle Company)?

can a electric light be changed to burn candles with a special adapter to put into the electric socket to hold the candle and possibly catch some wax as it burns. i had read about such an invention and now can’t find it. please help me if you can.