To make liquid soap, you can either melt down solid soap (like Castile soap) in water or create a liquid soap from scratch using oils and lye. The easiest method involves grating or chopping solid soap, dissolving it in hot water, and then optionally adding glycerin for smoothness and essential oils for fragrance.
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Here's a more detailed breakdown of the process:
Method 1: From Solid Soap Bars
Grate or Chop: Grate a bar of solid soap or chop it into small pieces.
Dissolve: Place the soap pieces in a saucepan with water and heat gently until the soap dissolves completely.
Cool and Dilute: Allow the mixture to cool and then dilute with more water to reach your desired consistency.
Optional Additions: Stir in glycerin for a smoother texture and essential oils for fragrance.
Bottle: Pour the liquid soap into a dispenser.
Method 2: From Scratch (with Lye)
1. Prepare the Lye Solution:
Carefully mix potassium hydroxide (lye) with distilled water, ensuring proper safety precautions (gloves and eye protection).
2. Melt Oils:
Melt the chosen oils (like coconut oil, olive oil, etc.) in a slow cooker or pot.
3. Combine:
Slowly pour the lye solution into the melted oils, stirring or blending until the mixture reaches a "trace" consistency (thick like pudding).
4. Cook:
Cook the mixture in the slow cooker (or on low heat) for a few hours, stirring occasionally, until it becomes translucent.
5. Dilute:
Dilute the soap paste with hot water, adding glycerin and essential oils as desired.
6. Bottle:
Pour the liquid soap into a dispenser.
This video demonstrates how to turn bar soap into liquid soap: