Walk through any grocery store and you'll find dozens of products labeled "soap" that aren't technically soap at all. Most are detergent bars, made with synthetic surfactants, petroleum-derived ingredients, and almost none of the skin-nourishing properties your skin actually needs. Cold pressed soap is something different entirely.
Here's what cold pressed soap really means, how it compares to other soap-making methods, and why the process matters more than most people realize.
What is cold pressed soap?
Cold pressed soap, more commonly called cold process soap in the soap-making world, is made by combining plant-based oils with lye (sodium hydroxide) at low temperatures. The two ingredients trigger a chemical reaction called saponification, which converts the oils and lye into soap and glycerin. No external heat is applied, which is where the "cold" in cold process comes from.
The result is a true soap in the most literal sense: a bar made entirely from oils that have been chemically transformed, with nothing synthetic added to make it lather, thicken, or preserve longer.
Why glycerin matters
Glycerin is a humectant, meaning it draws moisture from the air to your skin and helps it stay hydrated throughout the day. In cold pressed soap, glycerin forms naturally during saponification and stays in the bar. In commercial soap production, it's typically removed because it's more valuable as a standalone ingredient in lotions and cosmetics.
This is one of the most significant differences between a handcrafted cold pressed bar and a mass-produced one. The commercial bar may clean your skin, but it's also stripping away the very thing that would help keep it moisturized.
How cold pressed soap compares to other methods
Cold process is one of several ways soap can be made. Each method produces a very different bar with different properties, trade-offs, and ingredient profiles.
The gold standard
Oils and lye combined at low temperatures. Long cure time produces a smooth, hard bar with maximum glycerin and skin-nourishing properties intact. This is what we use at Hearth & Haven.
Faster, still natural
External heat speeds up saponification. Still natural and glycerin-rich, but the accelerated process can affect texture. Bars are ready sooner but often look more rustic.
Beginner-friendly base
A pre-made soap base is melted, customized, and poured. No lye handling required. Quality depends entirely on the base used. Some are clean; many contain synthetic ingredients.
Not really soap
Made with synthetic detergents rather than saponified oils. Glycerin is removed. Lathers well due to added surfactants, but strips the skin's natural moisture barrier over time.
What goes into a good cold pressed bar
The quality of a cold pressed soap comes down almost entirely to the oils used. Different oils bring different properties to the bar. Olive oil adds a conditioning, skin-softening lather. Coconut oil contributes hardness and strong cleansing. Castor oil boosts lather and helps other oils perform better. Shea or mango butter adds creaminess and moisture.
A well-formulated cold pressed bar is "superfatted," meaning a small percentage of the oils are left unsaponified intentionally. Those free oils condition the skin as the soap rinses away, leaving your skin feeling clean without that tight, stripped feeling you get from commercial bars.
What to look for on the label
Real soap ingredients look like oils. A clean cold pressed bar's ingredient list should read like a list of plants: sodium olivate (saponified olive oil), sodium cocoate (saponified coconut oil), sodium shea butterate. If the first ingredients are sodium lauryl sulfate, cocamidopropyl betaine, or anything ending in "-eth," you're looking at a detergent bar, not real soap.
Short ingredient lists are a good sign. Cold pressed soap doesn't need preservatives, synthetic thickeners, or stabilizers. If the list is long and hard to pronounce, that's worth questioning.
Fragrance disclosure matters. Even in natural soap, "fragrance" can hide synthetic compounds. Look for bars that specify essential oils or certified clean fragrance, and disclose what's actually in it.
Cure time is a quality signal. A properly made cold pressed bar takes four to six weeks to cure. Makers who skip or shorten that process produce a softer, mushier bar that dissolves faster in the shower. Patience in the process translates directly to a better bar in your hands.
Frequently asked questions
What is cold pressed soap?
Cold pressed soap (also called cold process soap) is made by combining oils and lye at low temperatures, preserving the natural glycerin and beneficial properties of the oils. Unlike commercial soap, no external heat is applied during the saponification process.
Is cold pressed soap better for sensitive skin?
Generally yes. Cold pressed soap retains natural glycerin, which draws moisture to the skin. Commercial soaps often strip glycerin out during manufacturing. For sensitive or dry skin, cold pressed soap with simple, plant-based oils is a gentler option.
What is the difference between cold process and hot process soap?
Cold process soap is made without added heat, allowing saponification to happen slowly over several weeks of curing. Hot process soap uses external heat to speed up saponification, resulting in a soap that can be used sooner but often has a rougher texture.
Does cold pressed soap contain lye?
All real soap is made with lye. However, no lye remains in the finished bar. The lye reacts completely with the oils during saponification, converting them into soap and glycerin. The finished bar is gentle, skin-safe, and lye-free.
Made in Denver, CO
Looking for natural cold pressed soap in Denver?
Hearth & Haven is a Denver-based maker of handcrafted natural soap, designed for people who care about what goes on their skin as much as what goes in their home. Our cold pressed bars are made in small batches using plant-based oils, no synthetic dyes, and no detergents. Each bar is fully cured before it leaves our hands, so what you get is a harder, longer-lasting bar that actually nourishes your skin.
Whether you're searching for Denver cold pressed soap, natural soap made locally, or just a cleaner alternative to what's on the drugstore shelf, we made Hearth & Haven for exactly that.
Hearth & Haven
Soap the way it was meant to be made.
Plant-based oils. Natural fragrance. Fully cured, handcrafted in Denver.
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