Each different make of wick is designed to be used in a certain type of wax and come in different sizes depending upon the diameter of your candle i.e. an ECO 0.5 wick is suitable for tealights and suitable for all types of wax but not suitable for any candle wider than a tealight for example a Votive or Pillar.
To work out which wick is best for your needs, first decide which wax you are using for example...Paraffin.........Natural (EcoSoya).........Beeswax........ReUsed/Recycled.
Then work out the diameter (width) of your candle i.e. mould, container etc
In each of my wick auctions it will tell you the wax it is suitable for and the "mm" diameter (width) of the candle to be made.
Even then, you would still need to make the candle and burn it to make sure the wick is correct as colour & fragrance can affect how a wick burns.
The ECO wick is a good all rounder as it is suitable for ALL waxes including ReUsed / ReCycled Wax.
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