The below process is a very quick way of finding suitable wicks for your candles. We recommend you conduct a slab test for every different blend of wax and oil that you intent to use, before making any candles :)
1. Mix the wax and your chosen oil at the required loading (typically 7-10% fragrance)
2. Pour the mixture into a large baking tray and allow to cool fully
3. Remelt the surface so that it is flat and allow to settle for at least 24 hours
4. Poke holes at ~10cm intervals using a skewer, screwdriver or similar
5. Insert various wicks that you think may be suitable (we recommend trying as many as possible)
6. Trim and light wicks in a draft free room
7. Allow to burn for 3-4 hours, observing for clubbing, excessive smoke or flame height and wick posture
8. Extinguish wicks, allow to cool and record diameter of melt pools for each wick, along with any observations on posture/clubbing/flame height
9. Remove wicks and any residue from wax, then remelt surface and repeat steps 4-8 as required (you may need pliers to remove the wicks)
10. Once complete, the wax can be used to make candles of various sizes and conduct confirmatory container tests.
The aim of slab testing is NOT to find a wick for a particular candle. It is to find a range of wick types that work well in the wax/oil blend without sooting, clubbing or creating excessive afterglow.