Lemongrass Eucalyptus Lemon Body Soap – Cold Process/Heat Transfer Method

For the 2019 Pittsburgh’s Soaper Gathering I was blessed to be a presenter.  For my presentation I demonstrated the Cold Process soaping method known by many as Heat Transfer or Thermal Transfer.  For the first two years of my soaping career this was the only method I knew. At that time it was called The Room Temperature Method.

I think for any beginner Soaper this is the easiest and simplest method to use.

My recipe is presented in percentages, PPO (per pound of oil) and parts, this makes it easier for you to adjust the recipe based on your needs. If you decide to use my recipe, please run it through one of the many free on-line soap calculators.

Depending on your learning style you may prefer the YouTube video over the written post. Click on the link to access the video     https://youtu.be/jmwRWtqC5S0


  1. You are knowledgeable of soap making processes, procedures, equipment requirements, safety precautions and cleanliness.
  2. You know how to use a soap calculator to determine the amount of Distilled Water and Sodium Hydroxide (lye) needed to make this soap.
  3. If you are not comfortable using water discount, you know how to convert to full water (Water-to-Oil ratio equals 38%)
  4. I have a standard policy. No matter where or from whom I obtain a soap-making recipe I always run it through a soap calculator. I hope you make this your policy too.


  • Two bowls – heavy plastic or stainless steel
  • Grinder
  • Whisk
  • Stick Blender
  • Mold
  • Towels
  • Spatulas – I find silicone are the best
  • Mesh strainer or cheesecloth
  • Bowls/jars for botanicals and essential oil blend
  • Measuring Spoons


Base Oils:

  • Castor Oil                             5%
  • Olive Oil                               15%
  • Rice Bran Oil                      13%
  • Sunflower Oil                     13%
  • *Red Palm Butter            34%
  • Coconut Oil 76 °              20%

*Red Palm is used in many parts of the world for cooking and is considered a superfood

*Can substitute Red Palm with Lard, Beef Tallow, Shea Butter, Cocoa Butter, and Babassu Oil.

Babassu Oil can be a substituted for coconut oil. The properties are similar.


  • Colloidal Oatmeal 1 Tablespoon, PPO
  • Coconut Milk Powder 1 Tablespoon, PPO
  • Sea Salt (snack or extra fine) 1 teaspoon, PPO
  • Sugar-Cane 1 teaspoon, PPO
  • Rosemary Antioxidant (ROE) 1-2 drops, PPO
  • Lemongrass leaves ¼ teaspoon, PPO
  • Eucalyptus leaves ¼ teaspoon, PPO
  • Lemongrass (India)-Essential Oil – 6 parts (0.5 oz PPO)
  • Eucalyptus Lemon- Essential Oil – 3 parts (0.5 oz PPO)
  • Arrowroot Powder 1 teaspoon, PPO

Lye and Water Ratios:

  • Superfat or Lye Discount                    8%
  • Water-to-Oil                                       26.70%
  • Lye Concentration                           33.33%
  • Water-to-Lye Ratio:                        2.0000:1



Lemongrass and Eucalyptus leaves are ground until the leaves are fine… almost like powder. Place leaves in a bowl or jar, using enough distilled water to cover leaves, and soak for at least 30 minutes. This can be done hours in advance.

Essential Oils:

Blend with Arrowroot Powder. Sit aside at least 30 minutes for full absorption. This can be prepared days in advance. If doing days in advance, be sure to store in a glass container with a non-rubber top and keep away from the heat and sun.

Distilled Water:

Dissolve sugar and salt and set aside until it is time to add the lye

Soft and Hard Oils are in separate containers.

Soft Oils:

Add in ROE and stir well

Add in Colloidal Oatmeal, using stick blender and blend well, until there are no lumps

Add in Coconut Milk Powder, using stick blender and blend well until there are no lumps.

Using cheesecloth or fine mesh strain, separate the water waste from the ground leaves. Discard the water. Add the leaves to the soft oil, using a stick blender and blend well until leaves are complete disbursed.

Hard Oils:

Break into small pieces to ensure the Lye Water melts oils completely


Add Lye to distilled water with dissolved sugar and salt. Stir until lye water is clear

Add Lye Water to Hard Oils and hand stir make sure they are fully melted

Add Soft Oils with additives to melted Hard Oils and Lye Water

Stick blend to emulsion

Add in essential oil blend and hand stir or whisk well. The soap will move fast due to the water discount. No need for a stick blender

Once soap comes to a light to medium trace, pour into mold

Optional – Texture top when soap gets thick, or leave as is

Spray top of soap with 91% alcohol to help prevent soda ash

Wrap soap in towels or blankets to keep soap warm

Unmold soap 24-48 hours

Cut soap in 1-inch squares or as desired

Leave soap to cure 3-6 weeks in a well-ventilated area and away from the sun.