Why You Should Buy Soy Candles
Many soy and botanical-based waxes are non-toxic and edible. (Although they taste bad, trust me.) The wax is non-petroleum based and often from a completely renewable resource which is completely biodegradable. Make sure to also get candles containers that are all-natural and candle dyes that are formulated specifically for candle use.
Many waxes if left uncolored vary from a creamy white to a pale yellow in color. If dye is added, we can achieve soft, creamy pastels to rich, dark, royal colors. Some custom candle makers can literally offer thousands of colors and match items in your home. Small candle shops can often color any scent to your favorite color. In other words, if you love cherry but your home is decorated in yellow - they can pour a yellow colored, cherry scented candle just for you!
No Color, Pale Pink and Rich, Vivid Red Candles: 
Make sure that fragrance oils are used that are specially formulated for the use in candle waxes, but not just any candle waxes - soy waxes.
Soy wax is like a sponge, it can only hold so much fragrance oil and then the extra will seep out as beads of "sweat" on the candle.
Candle makers that don't have your favorite scent in stock often require you to make a large order, so check before you buy.
Some of the best wicks are coreless, all cotton braided wicks which are designed to bend at the tip when burning, forcing the tip of the wick into the outermost portion of the flame where it burns hottest. The result is more complete combustion, leaving less carbon buildup (mushrooming) behind and less smoking. They require less trimming, but still have to be trimmed for best burning results.
Good candles completely liquify as they burn. Larger candles will have 1-2" of liquid wax and the smaller candles will turn completely into liquid. The hot, liquid wax is what throws the wonderful aroma. The beauty of the candle in the jewel tones shimmering from the flame is something you must see for yourself. The jars stay very clean if the wicks are trimmed properly before and during the burn time.