Gather your supplies.
Set your scale to the ounce unit and weigh your willow bark. Note: the willow bark expands significantly after it absorbs the alcohol, so don't use too much willow bark. I had only 1.4 oz of willow bark left, so there is plenty of space for it to expand.
Add the willow bark to the jar.
Take the weight of your willow bark (in ounces) and multiply it by 5. This is how much alcohol you will use. I had 1.4 oz of willow bark, so I multiplied 1.4 x 5, which equals 7. I will add 7 oz of alcohol. We are using 1 part dried herbs to 5 parts alcohol (1:5).
Now place the jar with willow bark on your scale, reset the scale to "0", and add your 100 proof vodka.
Put on a lid and shake a few times. Label (see notes for how to label).
Let the jar sit for 4-6 weeks, shaking daily.
Now to harvest the tincture! Line a mesh strainer with cheesecloth and place it over a bowl or container.
Pour the contents of the jar into the lined strainer and allow the tincture to fully drain into the container.
When the liquid is drained, gather up the corners of the cheesecloth and squeeze out any remaining liquid. Your tincture will be the color of rust.
Use a container with a pour spout to pour tincture into an amber bottle. Label your tincture. *Free tincture label template here. It is ready for use!