How much lye (NaOH) and water for your oil weights.
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Silicone loaf soap moldA 9-bar silicone loaf mold is the standard for cold-process. Silicone releases without cutting. Brambleberry and Nurture Soap are the two supply brands most soapmakers use.
Lye (sodium hydroxide)Sodium hydroxide is required for true cold-process soap. Essential Depot and Brambleberry sell food-grade NaOH. Always add lye to water — never water to lye.
Cosmetic mica colorantsCosmetic-grade mica powers are skin-safe and don't bleed in cold-process soap. TKB Trading and Mad Micas have consistent color matching between batches.
Fragrance and essential oilsSoap-safe fragrance oils (from Brambleberry, Wholesale Supplies Plus) are tested not to seize or discolor batter. Plain essential oils can behave unpredictably in cold process.
Stick blender (immersion)Any 200W+ stick blender works for soap — Cuisinart CSB-75 or KitchenAid are common. Soap is caustic; dedicate the blender to soap-making only, don't use it for food.
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