Doubled over cheese cloth works great and so does a clean scrap of fabric like a hand cloth or T-shirt.Using a metal double burner would be safer! I used glass here with a super low flame to show the ingredients more clearly. when you pour in the cooler temperature oil, the beeswax partially solidifies. Continue stirring to re-melt.After the beeswax and oil are completely melted, remove from flame and add essential oils if desired.Let the salve cool completely before moving.