Gather materials: soap base (melt-and-pour) or oils + lye, distilled water, thermometer, digital scale, heat-safe container, silicone molds, immersion blender (for cold process), stirring utensils, safety gear
For melt-and-pour: cut or grate soap base, add to heat-safe container
Melt soap base using microwave in short bursts or a double boiler until fully liquid
Cool melted soap base to about 110–130°F (43–54°C)
Add fragrance and/or essential oil (typical: 0.5–3% by weight) and mix thoroughly
Add colorant (melt-safe soap dye) and mix thoroughly
Add optional additives (exfoliants, botanicals, mica) and mix thoroughly
Remove bubbles by lightly misting with rubbing alcohol or briefly spritzing with alcohol
Pour into molds
Optional: spritz alcohol again to reduce bubbles
Let soap set until fully hardened (typically 30–60 minutes)
Unmold soap
Cure/store as needed (melt-and-pour typically ready immediately)
For cold process (lye-based): calculate formulation using a lye calculator (target oils, desired hardness/cleansing, superfat, and water discount)
Weigh oils and lye precisely using a digital scale
Dissolve lye in distilled water in a well-ventilated area; stir until fully dissolved
Cool both lye solution and oils to roughly 95–110°F (35–43°C)
Combine lye solution into oils and blend to trace (light custard consistency)
Add fragrance/essential oils and mix
Pour into molds
Insulate molds (wrap or box) for 24–48 hours
Unmold and cut into bars
Cure 4–6 weeks in a cool, dry, ventilated area
Label and store cured bars
Safety steps for lye-based soap: wear gloves, eye protection, long sleeves, and work in ventilation
Keep lye off skin and clothing; add lye to water, not water to lye
Clean tools and surfaces after use and dispose of waste safely