Cold process soap making is a method that involves mixing oils and lye (sodium hydroxide) to create soap through a chemical reaction known as saponification. This method does not require external heat after the initial melting of solid oils, making it a straightforward approach for beginners and experienced soap makers alike.

Olive oil is a popular choice for soap making due to its gentle and moisturizing properties. It creates a creamy lather and is suitable for all skin types, including sensitive skin. Olive oil soap, often referred to as Castile soap, is known for its nourishing qualities and is less drying compared to soaps made with other oils.

To make a basic olive oil soap using the cold process method, you will need the following ingredients:

16 oz. (454 g) Extra Virgin Olive Oil: Provides moisturizing properties.
2.05 oz. (58 g) Sodium Hydroxide (Lye): The key ingredient for saponification.
3.67 oz. (104 g) Distilled Water: Used to dissolve the lye.
Optional: Essential oils (e.g., lavender) for fragrance.

Before you start, gather the following equipment:

Safety gear (gloves, goggles, and an apron)
A digital scale for precise measurements
A stainless steel pot for melting oils
A heat-proof container for mixing lye
A stick blender
Soap molds
A thermometer to monitor temperatures

Ensure your workspace is clean, well-ventilated, and free from distractions. Wear your safety gear throughout the process.

Measure the Water: Pour the distilled water into a heat-proof container.
Add the Lye: Carefully add the sodium hydroxide to the water (never the other way around). Stir gently until fully dissolved. The mixture will heat up significantly; allow it to cool to around 100°F (38°C).

In a stainless steel pot, warm the olive oil on low heat until it reaches approximately 100°F (38°C).

When both the lye solution and olive oil are within 5°F of each other, pour the lye solution into the olive oil. Use a stick blender to mix until you reach "trace," which is when the mixture thickens to a custard-like consistency.

If desired, stir in essential oils for fragrance at this point.

Carefully pour the soap mixture into your molds. Tap the molds gently on the counter to release any air bubbles.

Cover the molds with a towel to insulate them and allow the soap to saponify for 24-48 hours. After this period, unmold the soap and cut it into bars.

Place the soap bars on a drying rack or wax paper in a cool, dry area. Allow them to cure for at least 4-6 weeks. This curing time allows the soap to harden and the lye to neutralize completely.

The entire process can take about 1-2 hours, not including the curing time, which usually takes 4-6 weeks.

Yes, while this recipe focuses on olive oil, you can experiment with other oils like coconut or shea butter for different properties. However, keep in mind that the lye calculations will need to be adjusted accordingly.

Yes, once the soap has cured for the recommended time, it is safe to use. The lye is fully neutralized during the saponification process.

Making cold process olive oil soap is not only simple but also allows you to create a gentle and nourishing product tailored to your preferences. With just a few ingredients and some patience, you can enjoy the benefits of handmade soap while avoiding the harsh chemicals often found in commercial products. Happy soap making!