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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Wick Drowning
When liquid wax overwhelms the tip and reduces oxygen, causing the flame to sputter or go out.
Wick Size
The chosen thickness/type that controls flame size, melt pool width, and overall burn behavior.
Wick Sticker
A heat-resistant adhesive used to secure the string base to the container bottom.
Wick Tab (Wick Sustainer)
A small metal base that anchors the string and keeps it upright in the container.
Wick Testing
The process of burning samples to dial in clean performance, good throw, and safe temperatures.
Wick Trimmer
A cutter designed to keep the tip at a safer length for cleaner burns and better throw.
Wine Soap
Soap made with wine, incorporating antioxidants and natural acids that can gently cleanse, nourish, and add a subtle color or aroma.
Wire Cutter
Uses a taut wire to cut soap cleanly and evenly, producing smooth bars with minimal drag or distortion.
Witch Hazel
A mild liquid used to bind ingredients without triggering fizz.
Witch Hazel (Skincare)
A botanical extract used to soothe, tone, and calm the skin.
Wooden Mold
A rigid, insulated mold—often lined—used to hold heat during saponification and produce evenly cured soap loaves.
Wooden Wick
A crackling option that can create wider melt pools but needs careful sizing to avoid soot.
Wooden Wick Candles
Candles that use flat wooden wicks to create a soft crackling sound and a wide, even flame
Working Time
The window of time available before the mixture becomes unusable.
Wrapping and Packaging
Materials and methods used to protect soap, preserve freshness, and present it attractively for storage or sale.
Wrinkles
Deeper lines formed by repeated movement and skin thinning.
You Can Shrink Pores
A false belief that pore size can be permanently reduced.
You Need Different Products for Day and Night
A belief that different formulas are mandatory for daytime and nighttime use.
You Outgrow Acne After Teenage Years
A false belief that acne disappears permanently with age.
Zap Test
A simple test for soap safety: touching the bar to check for lingering lye, which causes a mild tingling or “zap” sensation.
Zinc Oxide
A mineral UV filter offering broad protection and skin-soothing benefits.