Ingredients for Bar Soap (NaOH + Oil)

To achieve a whipped foam texture and make your bar soap harder and dissolve slower, you can consider incorporating the following ingredients:

For Whipped Foam Texture

While traditional NaOH+oil soap naturally produces foam, you can enhance the texture to be creamier or more whipped by carefully adding secondary surfactants. Please note that adding these to a saponified bar soap requires careful formulation and testing, as they are typically used in liquid washes or syndet bars.

• Creamy Foamer™ (Sodium Methyl Cocoyl Taurate): This ingredient is known for creating a soft and smooth foam. It can potentially improve the lather quality of your bar soap.
• IseFoam™ (Sodium Lauroyl Methyl Isethionate): This is another gentle detergent that produces good foam and is sometimes used in solid formats like bath bombs. It could help boost foam in your bar soap.

Experimentation with small batches is recommended when adding these to a traditional bar soap recipe.

For Hardening and Slower Dissolving

To make your bar soap harder and last longer, consider these additives:

• Sodium Stearate: This is a widely used hardening agent for bar formulations. Adding extra Sodium Stearate can significantly increase the hardness and decrease the dissolution rate of your soap bar.
• Stearyl Alcohol: This fatty alcohol acts as a thickener and stabilizer. It can contribute to the bar's structure and hardness, helping it dissolve slower.

Incorporating oils high in stearic acid (like Stearic Acid itself, or Shea Butter, Cocoa Butter) in your initial oil blend also naturally increases the soap's hardness through saponification, forming Sodium Stearate in situ. However, adding pure Sodium Stearate or Stearyl Alcohol allows for more direct control over the final bar properties.

Always test your formulation to achieve the desired balance of foam, hardness, and skin feel.