What is a Maceration??
Macerations are a type of potion. It is used for the most delicate herbs and flowers, which lose much of their effect if exposed to boiling water, and for stones, which can be damaged by being heated.
It's also useful when you ar using water that has already been charged--for example, when you have collected dew water in the spring and water to make an herbal potion with it. Heating the water will dispel most of the cahrge, and so a cold maceration is a much more useful approach.
What you will need:
All you need to prepare a maceration is a clear glass jar with a tight lid--canning jars work very well for this purpose--a sunny or moonlit windowsill and a strainer.
How it is done:
If you've ever made sun tea, you already know how to make a magical maceration. Put the substance to be macerated into the jar, and add the water. Seal the jar and put it on the windowsill. How long you let it sit there will depend on what you're macerating--3-6 hours for herbs, up to 3 days for stones.
At the end of that time, pour the maceration through the strainer into another container.
Stones lose nothing by the process--the only thing they impart to the water is a magical charge.--and should be saved and used again.
Most macerations should be used within a day or two of making, as they tend to sour if kept for longer.
Info from "Natural Magic" by John Micheal Greer