Beard Care Guide · How It's Made

Understanding the Cold Process: Beard Shampoo Soap

A cold process shampoo soap is a different thing from a bottle of liquid beard shampoo. It's a solid bar, made slowly by hand, and the ingredients and method are what make it work. Here's what goes into ours, and the science behind how a bar of soap is actually made.

If you're after a liquid wash instead, that's a separate product with a separate job; we cover it in our guide to the best beard shampoo for dandruff. This piece is about the bars.

The ingredients, and why they're there

The heart of our soap is its butters and oils. Shea, Cocoa and Mango butters are the backbone: they give a creamy, nourishing cleanse and keep the bar itself hard and long-lasting. Argan, Castor and Jojoba oils add lather and hydration. The real result comes from how they're blended together, not from any single ingredient.

The butters: Shea, Cocoa and Mango

• Shea Butter: rich and nourishing, it gives a gentle but effective cleanse and lends the bar a harder texture so it lasts longer. Used at roughly 5 to 20%, it does more than clean; it conditions.
• Cocoa Butter: adds hardness to the bar while keeping that creamy lather. Used around 5 to 20%, it pairs perfectly with Shea to boost the nourishment.
• Mango Butter: a little more hardness and a nourishing touch, used by some between 5 and 20%, so the beard feels as good as it looks.

The oils: Argan, Castor and Jojoba

• Argan Oil: often called liquid gold, it's rich in vitamins and great for skin, and it elevates a shampoo bar. The trick is balance: we never build a soap around Argan alone, using it at about 10% so the bar doesn't come out too soft.
• Castor Oil: soft and moisturising, it keeps the beard and the skin beneath hydrated, and it's what gives a bar that splendid lather. Used around 3 to 7% in soap, higher in a dedicated shampoo bar.
• Jojoba: (pronounced ho-HO-ba) a bit of an unsung hero. This waxy oil suits shampoo and facial bars and can even help extend the shelf life of the soap. Recommended at 5 to 10%.

A few tips for aspiring soap makers

• Research is key: every oil and butter has its own strengths. Knowing them is how you build the right bar.
• Balance is crucial: as with the Argan tip, too much of a good thing can backfire.
• Patience pays: cold process isn't a hurried affair. Once you've melted your ingredients and made your lye solution, let it cool to at least 50 degrees Celsius before mixing, then give the soap time to cure.
• Safety first: sodium hydroxide (lye) is caustic and will cause serious irritation, so use proper safety gear. Never use aluminium utensils or pots with lye, unless you fancy an unwanted science experiment.

The science of cold process

Cold process soap making is a blend of chemistry and craft. The key stages:

• Saponification: the core reaction. When fats or oils (triglycerides) meet a strong alkali (lye), they break down into glycerol and fatty acid salts, which is soap. The reaction is exothermic, so it releases heat.
• Lye: sodium hydroxide dissolved in water. It heats up and releases caustic fumes, so it's handled with gloves and goggles. The acids in the oils neutralise the alkalinity of the lye during saponification.
• Trace: the point where the oils and lye have emulsified and begun to thicken to a pudding-like consistency. Once there, additives like fragrance can be stirred in.
• Curing: once poured and set, the soap isn't ready to use. It cures for 4 to 6 weeks, letting water evaporate for a harder, longer-lasting, milder-pH bar. Glycerin, a natural byproduct, stays in the soap as a humectant that draws moisture to the skin.
• Superfatting: adding a little more oil than the lye needs, so the finished soap moisturises rather than over-cleans, and no free lye remains.
• Natural glycerin: commercial soaps often strip glycerin out to sell separately. Cold process keeps it in, for natural moisture.
• pH: a finished cold process bar sits around pH 8 to 10, naturally alkaline, which discourages bacterial growth, so it generally needs no preservatives.

Whether you reach for a bar or a bottle, the aim is the same: cleanse the beard without stripping the skin underneath. If you prefer a liquid wash, our SLS-free beard shampoo guide explains why sulphate-free matters; and to keep the beard soft after washing, a beard butter is the natural next step.

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Part of the RUNESILK beard care guides. Browse the beard soaps, or read our best beard shampoo for dandruff guide.