A behind-the-scenes look at the chemistry behind our double extraction process and what a jar of separated layers reveals about how we craft every batch.
We didn’t set out to run an experiment. We simply poured a bottle of Evil Bone Water into a jar of plain water, set it on the counter, and watched. What happened next was a beautiful, accidental science lesson one that reveals exactly why our double extraction process produces the most potent Zheng Xie Gu Shui on the market.
If you’ve ever wondered what’s actually inside a bottle of Evil Bone Water, this little demonstration tells the whole story. When the finished liniment hits water, it reverses the very process we use to create it—and the layers that form are like reading the recipe in reverse.
Evil Bone Water (Zheng Xie Gu Shui) poured into water, beginning to separate into distinct layers. The Saint Apothecary bottle shown for reference.
Here’s what happened. We poured a full bottle of Evil Bone Water into a glass jar of water at room temperature. No stirring, no shaking—just let gravity and chemistry do their thing. Within minutes, the liquid started telling a story.
The rich golden-amber color you see in the jar? That’s what Evil Bone Water looks like during the mixing process when the alcohol percentage is too low to hold everything in solution. It’s a color we know well at Saint Apothecary headquarters because we see it in every batch.
In production, the liquid “clears” when we hit that sweet spot of 74–76% alcohol concentration. Below that threshold, the medicinal compounds start falling out of solution—and that’s precisely what you’re watching happen in reverse when it hits water.
Temperature matters too.Cold water accelerates the separation. The colder the environment, the faster those medicinal compounds drop out of the alcohol-water matrix.
As the separation progresses, the jar settles into distinct visible layers. Each one represents a different category of medicinal compound that Evil Bone Water carries to your body when applied topically.
This golden layer rising to the surface contains essential oils and fat-soluble medicinal compounds—including camphor (Zhang Nao), menthol (Bo He Nao), and the volatile oils extracted from cinnamon bark (Gui Pi). These are the compounds responsible for Evil Bone Water’s penetrating warmth and cooling sensation. They’re hydrophobic and naturally float to the top.
The clearer middle section is water mixed with the remaining alcohol and water-soluble medicinal compounds—polysaccharides, certain saponins from notoginseng (San Qi / Tian Qi), and flavonoids from herbs like Huang Qin (Scutellaria root). These compounds dissolve easily in water and stay more evenly distributed.
Over time, expect a gooey, resinous layer settling at the bottom. These are heavier plant resins, dense alkaloids, and concentrated extracts from ingredients like E Zhu (zedoary rhizome) and Hu Zhang (knotweed rhizome) that are too heavy to stay suspended once the alcohol can no longer hold them in solution.
All of those medicinals coming out of solution? That’s exactly why Evil Bone Water works as powerfully as it does. Every one of those layers represents therapeutic compounds that penetrate your skin when you apply the finished product.
Here’s where it gets really interesting. The separation you see in that jar is the reverse of our actual production process. Understanding what happens when the formula falls apart helps explain why building it up is such precise, painstaking work.
Every batch of Evil Bone Water begins as a water decoction—roughly 135 gallons. This is the ancient technique of Traditional Chinese Medicine (TCM): boiling tough roots, barks, and rhizomes in water to extract their water-soluble therapeutic compounds.
The herbs are simmered to draw out polysaccharides, glycosides, flavonoids, and other hydrophilic (water-loving) medicinals that alcohol alone can’t fully capture.
Special step: Certain herbs get extra attention before they ever touch the decoction pot. The imperial-grade Gui Pi (cinnamon bark) is pre-soaked in Everclear for 12 to 72 hours to soften the cell walls and help prevent volatile oils from escaping when the heat comes.
Each batch starts as about 135 gallons of water decoction and finishes as around 300 gallons of alcohol extraction. That growth isn’t dilution, it’s the addition of Everclear 190-proof grain alcohol that pulls an entirely different class of medicinal compounds from the herbs.
Once the water decoction is complete, the real alchemy begins. High-proof Everclear is gradually introduced. This is where the process mirrors what you saw in the jar—but in reverse.
As alcohol concentration rises, compounds that were invisible or dissolved in the water phase begin to change behavior. The liquid goes through remarkable visual stages—changing colors, looking strange, sometimes appearing cloudy or opaque.
That golden-amber hue from the jar experiment? That’s what the batch looks like when the alcohol percentage is still climbing but hasn’t yet reached the critical clarifying point.
Different medicinal compounds have different solubilities:
The goal of a double extraction is to capture both classes of therapeutic compounds in a single, stable solution.
At 74–76% alcohol concentration, the solvent mixture reaches a point where it can hold both hydrophilic and lipophilic compounds in a stable solution at the same time.
It’s a precise balance—centuries of Traditional Chinese Medicine practice, confirmed by modern extraction science.
Here is a video of before and after
There’s a day during every batch we call “clarifying day,” and it’s one of the most important—and favorite—days at headquarters.
This is when the camphor (Zhang Nao) and menthol (Bo He Nao) are added. But these aromatic compounds don’t just jump into solution willingly. They must be teased into dissolving through careful agitation, air exposure, stirring, and patient mixing.
Weather matters. Humidity, temperature, and barometric pressure can affect how readily compounds dissolve. Some days, we add a small amount of additional alcohol to push the solution past the clarifying threshold.
This process can’t be rushed. It requires experienced eyes and hands people who know what each stage should look like, smell like, and feel like.
“It goes through cool stages where at times, it looks weird and definitely changes colors along the way.”
— Saint Apothecary production team
Those three layers in the jar aren’t just a cool visual. They represent three categories of therapeutic compounds working together when you apply Evil Bone Water to an injury, sore muscle, or arthritic joint.
A single extraction—water alone or alcohol alone—captures only part of the formula. Double extraction is how Evil Bone Water captures the full spectrum of compounds from the classic Zheng Xie Gu Shui formula.
What you see when Evil Bone Water separates in water is the finished product “unmaking” itself—all those carefully extracted medicinal compounds falling out of solution because the alcohol concentration can no longer hold them together.
It’s a visual reminder that every bottle contains water-soluble and fat-soluble therapeutic compounds working in concert. That’s the power of a true double extraction, and it’s why no single-extraction liniment can match what’s inside every bottle of Evil Bone Water.
