Set up a small double boiler. You don't need to buy a double boiler. Use some canning lids or buy a double-boiler maker stand.
Fill the bottom of your double boiler with about an inch of water, or to just below the stand in your pot (if using one). You don't want water touching the pot that will hold the beeswax.
Turn the heat to simmer. No need for high heat. We are gently melting the wax to preserve its good properties.
Add 1 ounce of beeswax to the pot. It will melt more quickly if cut into small chunks.
Heat beeswax gently until just melted. Turn off the heat.
Remove the pot with the beeswax and stir in the herbal oil. Keep stirring until everything is melted. If the beeswax seizes too much, put it back on the double boiler. There is still plenty of heat, so no need to turn it back on. I prefer to keep heat exposure to a minimum to avoid degrading the oil's herbal medicinal properties.
Once it is melted, we will transfer the warm mixture to a small container that will fit the head of a stick blender.
Let the mixture cool completely.
Once the mixture has cooled and solidified, use the stick blender to whip the mixture.
Use the spatula to scrape the sides to make sure it is all blended.
Use the spatula to transfer the whipped salve into the 4 oz amber jar. Use a good spatula to scrape all the corners!
Close the jar with a lid, and label it with the type of salve and the date it was made.