Soap Making Blog

A gloved hand holding a glass jar of pale, freshly cut cold-process soap bars stacked on a wooden curing rack beside a small pile of coconut oil and olive oil bottles.

Guides

What Is Saponification? How Oil and Lye Become Soap

What is saponification? See how lye turns oils into soap and glycerol, where a SAP value comes from, and why trace, heat and gel don't show it's done.

By The Soap Brain Team · October 29, 2026

A glossy, translucent, petroleum-jelly-like soap paste being stirred with a spatula in a slow cooker insert on a kitchen counter.

Guides

How to Make Liquid Soap: KOH Paste, Dilution, Fixes

Learn how to make liquid soap from scratch: cook a KOH paste, dilute it, thicken it, and fix cloudy, oily or thin batches. Includes two recipes.

By The Soap Brain Team · October 27, 2026

A silicone mini-cube tray of frozen breast milk cubes next to a digital kitchen scale holding a small glass bowl with a few thawing cubes, on a light kitchen counter.

Guides

How to Make Breastmilk Soap: Melt and Pour or Cold Process

Learn how to make breastmilk soap with just 30 g of milk in melt and pour, or stretch a small stash in cold process. Includes keepsake and storage tips.

By The Soap Brain Team · October 22, 2026

A soapmaker's hands stirring thick, pale batter in a stainless steel pot with a silicone spatula, a lined wooden loaf mold open on the counter beside it.

Guides

Essential Oils for Soap Making: Rates, Picks and Fixes

Scent gone after cure, or batter seized up? Learn which essential oils for soap making hold up in lye, how to work out grams, and when to add them.

By The Soap Brain Team · October 20, 2026

A row of cured handmade soap bars on a wooden rack beside a pH meter probe resting in a small glass of cloudy soap solution.

Guides

Soap pH: What's Normal, Why It's Alkaline, How to Test

Why soap pH is always alkaline, what cured handmade bars usually read, and how to test it with a meter and interpret a reading above 11.

By The Soap Brain Team · October 15, 2026

Gloved hands hold a white plastic jug with a screw cap and a handwritten label reading 1:1 lye solution, caustic, do not drink, with a mixing date, in front of a closed cabinet shelf of soap-making gear.

Guides

Master Batching Soap: 1:1 Lye Solution and Oil Blends

Master batching cuts soap-day prep. Mix a 1:1 lye solution, dilute it by weight, blend oils ahead, and fix crystals, weak lye and separated oils.

By The Soap Brain Team · October 13, 2026

Freshly cut pale cream bars of cold process soap spaced out on a wooden curing rack on a kitchen counter beside a window, with a knife and a soap cutting board nearby.

Guides

Tallow Soap Recipe: A Hard, Long-Lasting Cold Process Bar

Make a tallow soap recipe with coconut and castor oils for better lather, plus how to render suet, handle fast trace, cut on time and cure for 6 weeks.

By The Soap Brain Team · October 8, 2026

A cured white coconut oil soap bar being grated on a box grater over a wooden cutting board, with a pile of fine white shreds and a glass mixing bowl beside it.

Guides

Laundry Soap Recipe: Coconut Bar, Powder or Liquid

Try this laundry soap recipe: a 0% superfat coconut bar, grated into powder or liquid, plus HE machine, hard water and troubleshooting tips.

By The Soap Brain Team · October 6, 2026

Cream-white cut bars of goat milk soap stacked on a wooden curing rack, with a small jar of honey and a scatter of rolled oats beside them.

Guides

Goat Milk Soap Recipe That Stays Creamy, Not Orange

A cold process goat milk soap recipe using frozen milk, staged lye and an ice bath, plus what to do when a batch scorches orange and smells off.

By The Soap Brain Team · October 1, 2026

A stack of cured white handmade soap bars on a wooden curing rack beside a sunny kitchen window.

Guides

Lye in Soap: Why None Is Left in a Cured Bar

Is there lye in soap you buy or make? See how saponification uses it up, how to read labels, and which lye to buy for your own bars.

By The Soap Brain Team · September 29, 2026

A soap loaf mould of thick pale batter with a whisk lifted straight up from the surface, leaving small sharp peaks, beside a spoon, fork, chopsticks and a piece of bubble wrap on a worktable.

Guides

12 Textured Soap Top Ideas for Cold Process Loaves

Match textured soap top ideas for cold process to your batter's trace: spoon peaks, fork combing, stamps and toppings, plus fixes for a top that falls flat.

By The Soap Brain Team · September 24, 2026

A row of freshly cut white and pink-flecked salt soap bars drying on a wooden rack with a tray of loaf-mold offcuts beside them.

Guides

Salt Bar Soap Recipe Cold Process: Fix Fast Trace

A salt bar soap recipe cold process makers can trust: oil blend, 50% salt, 18% superfat, plus how to stop batter setting before you pour.

By The Soap Brain Team · September 24, 2026