Cold Process Soap Making — FarmPal

Create natural, handmade soap from scratch using oils, lye, and your choice of natural additives.

Time Required
1-2 hours active time, 4-6 weeks curing
Season
See notes

Benefits

  • •Control over ingredients no harsh chemicals
  • •Cost-effective once you have supplies
  • •Makes excellent gifts
  • •Can incorporate herbs, honey, and goat milk from homestead
  • •Reduces plastic packaging waste

Steps

1
Calculate Your Recipe

Use a lye calculator to determine exact amounts of lye and liquid for your oils. Never guess precision is essential for safety.

  • 💡 Popular beginner oils: olive, coconut, palm (or sustainable alternative)
  • 💡 Super-fatting (extra oils) makes gentler soap
  • 💡 Run every recipe through a lye calculator, even published ones
2
Prepare Your Workspace

Work in well-ventilated area. Have all tools and ingredients ready. Keep vinegar nearby (for splashes), wear protective gear.

  • 💡 Cover surfaces with newspaper or plastic
  • 💡 Keep pets and children away
  • 💡 Have dedicated equipment that won't be used for food
3
Make the Lye Solution

Carefully add lye to cold liquid (never reverse). The mixture will heat up dramatically and release fumes.

  • 💡 Always add lye TO liquid, never liquid to lye
  • 💡 Use heat-resistant container (high-density plastic or stainless steel)
  • 💡 Work outdoors or near open window for fumes
4
Combine and Bring to Trace

When lye solution and oils are both around 100-110°F, combine and blend to trace (pudding-like consistency).

  • 💡 Stick blender speeds up process dramatically
  • 💡 Light trace for intricate designs, thick trace for rustic swirls
  • 💡 Add extras (herbs, essential oils, color) at trace
5
Mold, Cure, and Use

Pour into molds, insulate for 24-48 hours, unmold, cut, and cure 4-6 weeks.

  • 💡 Silicone molds release easily
  • 💡 Cure allows saponification to complete and water to evaporate
  • 💡 Longer cure means harder, milder, longer-lasting bars

Tools Needed

Digital scale (accurate to 0.1g)
Stick blender
Heat-resistant containers
Soap molds (silicone or lined wood)
Safety goggles and rubber gloves
Long sleeves and closed-toe shoes
Dedicated mixing equipment

⚠️ Safety

  • •Lye is caustic and can cause severe burns
  • •Always wear goggles, gloves, and long sleeves
  • •Never leave lye unattended around children or pets
  • •Lye fumes are dangerous ensure good ventilation
  • •Keep vinegar nearby to neutralize splashes
Seasonal Notes
Can be made year-round. Cure in well-ventilated, dry area. Lower humidity aids curing.