Basics

TL;DR: Starting with soap making? This section guides you through the basics of cold process — from understanding saponification to lye safety, your first recipe and equipment list. Starting from scratch, spend 30 minutes reading and you're ready to make soap.

Cold process soap making starts with one step: understanding what happens during saponification. Sodium hydroxide reacts with plant oils to form soap salts and glycerin — simple chemistry that works reliably in a home workshop with proper conditions and safety precautions.

This section covers everything you need for your first successful batch of soap.

Guides in the Basics section

What is cold process and how does it work?

Pillar page vysvětluje saponifikaci přístupnou formou: co se děje na molekulární úrovni, kdy nastává trace, proč mýdlo potřebuje 4–6 týdnů zrání a jaký je rozdíl mezi cold process, hot process a Melt & Pour. Délka: komplexní průvodce.

Key terms: saponification, trace, gel phase, curing, superfat

Your first recipe — step by step

The simplest three-oil recipe (coconut + olive + sunflower oil) with maximum detail for every step. Choose Your first recipe — no fragrance, no colorant, just pure soap making. Ideal for verifying the process before more complex recipes.

Contents: equipment list, gram measurements, SoapCalc calculation, step-by-step instructions, what to expect during curing

Safe work with NaOH lye

Sodium hydroxide is the riskiest component of the process. This safety page covers everything: proper PPE, dilution procedure (always lye into water), first aid for burns, storage and disposal. Essential reading before your first batch.

Key point: lye into water, never water into lye — exothermic reaction

Equipment for soap making — where to buy

What is the bare minimum (digital scale, stick blender, silicone mold, thermometer, PPE), what is useful and what is unnecessary to start? Complete shopping equipment guide also includes approximate costs and where to buy.

Approximate start-up costs: CZK 1,500–3,000 for complete basic equipment

FAQ for beginners — 20+ most common questions

Compact answers to questions every beginning soap maker asks: Is soap making dangerous? How much does it cost to start? Where to get lye? Why did my soap go soft? What is trace? Each answer with a link to a more detailed guide.

How to proceed: recommended path for beginners

Step 1: Read What is cold process — 15 minutes of reading that saves hours of mistakes.

Step 2: Study Lye safety and get PPE before buying ingredients.

Step 3: Check the equipment list and get what's missing.

Step 4: Try the first recipe — 500 g of oils, simple procedure, no surprises.

Step 5: Once the first batch is curing, explore recepty for next steps.

Basic cold process terms

Saponification: Chemical reaction between fats/oils and sodium hydroxide (NaOH) that creates soap salts (stearates, palmitates...) and glycerin.

Trace: The point when the soap mixture thickens to the consistency of light pudding. Signals emulsification — fragrances, colorants and additives can be added and poured into the mold.

Superfat (SF): Intentionally reducing the amount of lye by 5–8% so some oils remain unsaponified — conditioning effect on the skin.

Gel phase: Phase when soap in the mold transitions to transparent gel and back — accelerates saponification and produces deeper colors.

Curing: 4–6 weeks after production when the soap hardens, pH drops and lather stabilizes.

SAP number: Saponification number — how many grams of NaOH are needed to saponify 1 gram of a given oil. The basis for recipe calculation.

Tools for recipe calculation

Before making soap you must calculate the exact amount of NaOH for your recipe. Never estimate.

• SoapCalc — the most widely used free web calculator, detailed guide
• Calculator comparison — SoapCalc vs. Brambleberry vs. SoapMaker 3

Frequently asked questions

What exactly is saponification? Saponification is a chemical reaction where fatty acids from oils/fats bond with sodium hydroxide. The result is soap molecules (which cleanse) and glycerin (which moisturizes). It takes 24–48 hours, but soap curing takes longer for alkalinity to drop.

How long does it take to make one batch of soap? The actual making takes 30–90 minutes (from weighing oils to pouring into the mold). The soap stays in the mold for 24–48 hours. Then you cut it and let it cure for 4–6 weeks (castile 6–12 months).

Do I need special equipment or can I buy everything at the store? You can buy everything at household stores (scale, blender, molds) or specialized e-shops. Minimum: digital scale (±0.1 g), stick blender (1000 W+), soap mold, thermometer, PPE. No special professional equipment required.

What happens if I forget to buy NaOH in advance? NaOH is not widely available - order 1-2 weeks in advance. Regular stores and supermarkets do not carry it. Search online for "sodium hydroxide“ or "NaOH“ at soapmaking e-stores.

Can I make soap in an apartment? Yes, but with limitations. Making soap generates mild fumes from lye, so good ventilation is mandatory. The living room is not ideal — use the kitchen, workshop or garage. Summer is more pleasant — cold in winter slows saponification.

Is it expensive to make soap at home vs. buying it in a store? Homemade production costs CZK 30–50 per 100 g of soap (material cost). Quality natural soap in stores costs CZK 100–250 per 100 g. Homemade is cheaper plus you can customize the formula, but the initial investment (equipment) comes to CZK 1,500–3,000.

What are the most common mistakes in the first attempt? Errors in SoapCalc calculation, poor temperature management of oils and lye, insufficient mixing (yellow layer on top), seizing from strong EO. All are instructive — they pose no safety risk, just aesthetic inconvenience.

See also:

• Recipes for beginners — 6 simple recipes
• Chemistry of saponification — a deeper look at the process
• Troubleshooting encyclopedia — what to do when something goes wrong