Make Peppermint Red Clay Cold-Process Soap (Mighty Mint)

man holding three bars of peppermint red clay 'mighty mint' soap of different shapes in his hands

Follow along as we make this natural cold-process soap, scented with peppermint essential oil and coloured with Mediterranean red clay. It is vegan, biodegradable and free of toxins such as (SLS, parabens and fragrance oils)

If you are new to soapmaking, please read our beginner’s guide to get started and reference the soap terms and definition list if you do not understand certain words.

Video tutorial

Our Recipe

The oil & butter blend for this recipe produces a mild and gentle bar of soap.

Ingredients Quantity (g) Notes
Total oil & butter 1500 -
Extra virgin olive oil 1050 70% of total oil & butter weight
Coconut oil 375 25% of total oil & butter weight
Shea butter 75 5% of total oil & butter weight
Sodium hydroxide (NaOH) 202 98% purity - 8% lye discount/superfat
Water 344 1.7:1 Water : NaOH
Mediterranean Red Clay 15 1% of total oil & butter weight
Pure Peppermint Essential Oil 15 1% of oil & butter weight

Tweaking the recipe

If you want to make a smaller/bigger batch, you can use the soap recipe calculator spreadsheet we made below. Feel free to double check the recipes with Soapmaking Friend.

Download the soap recipe calculator

screenshot of soap recipe calculator

(it is in the OpenDocument Spreadsheet format – a free and open source format that can be opened with Microsoft Excel and Google Sheets or consider using free software like LibreOffice on PC or Collabora Office on mobile)

Step by Step Instructions


Peppermint Red Clay Soap




  1. Have the recipe on hand, make adjustments to the batch size as necessary. Double check the math using Soapmkaing Friend.
  2. Prepare your workstation with all your tools, ingredients and safety gear
cold-process soap workstation with tools and materials prepared
prepare cold-process soap workstation
  1. Weigh out and melt coconut oil and shea butter using double-boiling method.
  2. Weigh out olive oil,combine it with other melted fats.
  3. Weigh out water & clay.
  4. Put on safety gear and weigh out sodium hydroxide. Carefully pour NaOH into water (never pour water onto lye as it will boil on contact and cause havoc!) and cover to protect from fumes. Stir occassionally to ensure all lye dissolves.
  5. Slowly pour lye solution into fat mixture and stir to combine. Using stick blender (remember to 'burp' it to remove air bubbles trapped in the shaft of blender) to pulse the mixture. Or use whisk to stir. Blend until it reaches light trace.
  6. Mix in red clay & peppermint essential oil. You might find it helpful to portion out a small amount of batter and whisk in the clay to prevent clumps. Be sure to weigh out exact amount of essential oil using a scale. Mix well.
use a sieve for the clay to help prevent clumps
  1. Pour batter into mould and insulate with towels if you desire a gelled soap.
soap is going through gel phase - see the deeper colour!
  1. You will be able to unmould within 24 hours. Let soaps cure for 4+ weeks in a ventilated area out of direct sunlight.
    Why cure the soaps?

    The curing phase is long but it is well worth it as water evaporates from the soaps during the process which helps them harden up to become more long-lasting rather than dissolving quickly during use. Also, curing lets the fats and lye become more acquainted with one another to become one. This makes the soap milder and its ability to create bubbles increases immensely over time.
    A special example of curing is castile soaps made of 100% olive oil which may take more than 6 months of curing to become a batter bar of soap.

Yay! You have made some great soaps!

Thank you for reading! We hope you learned something new!