Why Does Natural Soap Sweat in Humid Weather?
A quality bar of handmade soap will often "sweat" in humid weather due to the high content of natural humectants. A humectant is a substance that readily absorbs moisture from its surroundings and handmade soap is high in glycerin.
Natural soap tends to sweat during humid weather due to the large amount of glycerin it retains.
Glycerin, a humectant that provides amazing benefits to soap, is a natural byproduct of saponification, the chemical reaction that produces soap.
In commercial soaps, the glycerin is removed and used to produce commercial lotions.
Handmade natural soaps, rich in natural glycerin, are the most moisturizing soaps you can find! When you wash with natural soap there is a thin layer of natural glycerin left behind, which will help draw moisture to your skin to keep it hydrated and prevent dryness.
The general health of the skin relates directly to its moisture content. Natural handmade soaps can help the skin maintain a moisture balance while nourishing the skin.
When natural soap sits out in humid conditions, the glycerin in the soap draws moisture out of the air and onto the soap which then appears as little beads of water on your soap bar--like morning dew on blades of grass.
So the sweating is actually moisture from the air that the glycerin attracts, not moisture coming from inside the soap. The more humid the environment and the more humectants in the soap, the more likely you'll experience this phenomenon.
Common Humectants in Soap that Cause Sweating
Dead Sea Salt & Mud
Unlike normal seawater which is about 85% sodium chloride, sodium is not the dominant element in the Dead Sea. The waters and salt in the Dead Sea contain a varied mix of magnesium, potassium, calcium chloride, and bromides.
The unique waters of the Dead Sea contain 27% of various salts compared to only 3% in normal seawater.
Magnesium salt, for example, has absorption properties that make it a powerful humectant.
Our Dead Sea Black Clay Soap is a natural soap made with mineral-rich Dead Sea mud bathing in the waters of the Dead Sea.
It helps stimulate blood circulation, balance and tone skin, and deep clean to remove impurities. It is also our soap that tends to sweat the most in humid months.
Honey & Castor Bean Oil
Honey and castor bean oil are also natural humectants, attracting and retaining moisture in the skin.
So soaps and shampoos containing added honey, and shampoo bars with loads of castor oil, may sweat even more.
We keep our soaps and shampoos in a temperature and humidity controlled environment and check every bar before packaging. But sometimes humidity still causes sweating.
If you receive your soaps during humid weather conditions, some of the soaps may be damp from the natural "sweat" of the soaps.
There is nothing wrong with your natural soap! It is not melting and it is safe to use. The wetness is just the glycerin and other natural humectants doing their job.