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Creating Cold Process Soap

Creating soap using the cold process method can be quite satisfying and very addictive. The cold process method is ideal for preserving the benefits of plant-derived oils and butters and can be customized down to the last ingredient!

Step by Step Cold Process Soap

Please read through the following prior to making your soap


Lye or caustic soda is an alkaline chemical that can cause chemical burns to any exposed part of your skin. It is a dangerous and corrosive product and needs to be handled appropriately to reduce risk of injury. When the lye is added to water it generates dangerous vapors that must not be inhaled. Always prepare the solution in a well ventilated area (outside is best) and wear safety gear:

  • long sleeves

  • gloves (disposable are good)

  • eye protection safety goggles

  • mask

Your Recipe

If you are new to soap making there are a number of excellent soap makers on YouTube who are so gracious in giving excellent information, and many will also place their recipe for use.

Soapmakers I Recommend

Obviously there are so many more, but these are the most excellent and generous creators of cool soap (in my opinion)

If you need any assistance with creating your own great soap recipe, I would recommend going to a Lye or Soap calculator where you can add the ingredients (butters, oils etc.) that you would like to use in your recipe, and it will enable you to see your recipe properties as well as the weights needed to produce your soap. They each have a Recipe section.

Check out these Online Calcuators

LyeCalc (great for beginner)

Prepare the Lye Mixture

It is strongly advised NOT to use a glass container as the lye can etch glass over time causing it to crack or break. Heat resistant plastics, silicone or stainless steel are excellent options (not aluminium or other metals as they react with the lye)

  • Place your plastic container on the scales and zero out its weight

  • Add distilled or purified water according to your recipe amount (this is also the time to add citric acid (see post on Citric Acid and Soap) or sugar if part of your recipe - make sure to dissolve these prior to adding the lye)