An unburned candle is just a piece of wax. And if you have no intention of burning it, why not buy a little sculpture of a frog that doesn't have a wick coming out of it's head or a colored vase for flowers that might reflect in the sunlight instead of a cylindrical piece of wax?
I have a friend that had the same two tapers in her candlesticks for more than a year. In the summer they got so hot from the sun shining through the window that they melted. I liked them better that way. It seemed like they'd been burned a little.
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The three candles I gave an Italian friend as a hostess gift were still sitting on her shelf several weeks later in the same way they'd been presented---a small glass with a blue handmade candle in it and two red tapers tied to the side with twine, all worth about 75 cents. When I asked why she hadn't burned them she said she wants to keep them as a gift. This is the mom of an 8-year old girl that comes for English lessons and at the end of every lesson we toast marshmallows on candles at my kitchen table. I thought my gift might inspire the same activity at home, but apparently at her house candles aren't meant to be burned.
Things that are shapes and figures shouldn't be candles. I received a gold, glittery Christmas tree candle this year which I lit right away. After a few minutes it was a tree with a big hole in the top and gold glitter oozing down its sides, but I enjoyed the temporary glow a lot more than a gold tree with an unlit wick where the star should have been. My red, white and blue stars for the 4th of July didn't have a point (no pun intended) after the first few minutes. I've had fish that turned into jellyfish, an Easter bunny that went deaf and mini-apples that became applesauce. All of these little disasters make me think the dictionary definitions are right.
Collins: a candle is a stick of hard wax with a piece of string called a wick through the middle.
You light the wick in order to give a steady flame that provides light.
MacMillan: a stick of wax with a string in it that you burn to give light.
Oxford: a cylinder block of wax with a central wick which is lit to produce light as it burns.
Dictionary.com: a long, usually slender piece of tallow or wax with an embedded wick that is burned to give light.