Lye (Sodium Hydroxide)
The essential alkali ingredient required to make bar soap from scratch. While lye is caustic and requires careful handling with gloves and eye protection, it's completely safe when used properly. During saponification (the reaction between lye and oils), lye transforms completely—properly made soap contains no lye in the finished product. Melt and pour and rebatch soap makers don't work with lye directly since saponification already occurred during base manufacturing.
Other Terms
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Retinol
A vitamin A derivative used to promote cell turnover and reduce signs of aging.
Retinol Irritation
Redness, dryness, or peeling that can occur when skin adjusts to vitamin A products.
Retinol Percentage
The concentration level that determines strength, effectiveness, and irritation risk.
Rice Bran Oil
A lightweight, antioxidant-rich oil that nourishes skin and adds a silky, smooth feel to soap.
Rice Bran Oil (Body Care)
A conditioning oil valued for softness and barrier support.
Ricing
A sudden thickening of soap batter that creates a grainy, rice-like texture during mixing.
Rinse-Out Conditioner (Regular Conditioner)
An everyday softener applied briefly and rinsed away for quick manageability.
ROE (Rosemary Oleoresin Extract)
A natural antioxidant added to soap to slow oil oxidation and help prevent rancidity.
Root Lifter
A targeted product used near the scalp to boost lift and support at the roots.
Rose Clay (Pink Clay)
A mild mineral clay added to soap for gentle cleansing, a soft pink hue, and a smooth, silky feel.
Rose Hip Extract
A plant extract rich in antioxidants and vitamins.
Rosehip Seed Oil
A nutrient-rich oil known for supporting regeneration and improving tone.
Rosehip Seed Oil (Body Care)
A regenerative oil known for improving tone and skin resilience.
Rosehip Seed Oil (Hair Care)
A nutrient-rich option that supports softness and elasticity, especially for dry or mature hair.
Rosemary Oil (Hair Growth)
A botanical oil sometimes used to support scalp health and improve the look of thickness.
Rosewater
A floral water used for gentle hydration and soothing effects.
RRD Wick
A flat braided series often used for pillars and tapers, chosen for controlled burn rates.
Rubber Mask (Modeling Mask)
A professional-style treatment that sets into a flexible rubbery layer.
Rustic Finish
A purposely imperfect look with natural texture, mottling, or handmade variation.
Safety Data Sheets (Bath Bombs)
Official documentation detailing ingredient safety.
Safety Data Sheets (Candle Making)
Official hazard and handling documents that explain safe storage, use, and emergency information
Safety Data Sheets (Skincare)
Official documents detailing ingredient hazards and handling.
Safety Gear (Cold Process)
Protective equipment used to shield skin and eyes from lye and raw soap during the soap-making process.
Safety Testing
Evaluation processes ensuring product safety.
Safflower Oil
A light, nourishing oil high in linoleic acid that softens skin and enhances soap’s moisturizing properties.