Recipe and instructions for how to make natural cold-process soap with peppermint essential oil. Includes a full DIY video explaining each step
This natural peppermint soap recipe is great for full-body use and is ideal for oily skin. It’s scented with peppermint essential oil that leaves a refreshing and slightly tingly feeling on your skin. The peppermint leaves in the recipe can come from your own garden or even from a peppermint tea bag.
It’s a good basic recipe that uses all natural and/or nature-identical ingredients. It’s a one pound batch that will make five or six mint green bars with pretty flecks. The instructions are also simple and I show exactly how to make it in a video.
DIY Soap Making Video
The first batch of soap I ever tried to make was natural Peppermint. That first attempt didn’t go so well and I recall my frustration now nearly seven years after the fact. I eventually figured out how to do it but it was difficult trying to teach myself from books. I learn so much better by seeing something done rather than reading about it — can you relate?
This first experience is one of the reasons I began offering soap making lessons. It’s also why I’ve chosen to share a Peppermint soap recipe for my very first Facebook LIVE video. You can watch that video below.
Natural Peppermint Soap Recipe
Makes 5-6 bars
454g / 1 lb batch
Technical info: superfatted at 8% and using water as 25% of the oils
114g / 4oz Water
63g / 2.2oz Sodium Hydroxide (also called Lye)
1/8 tsp dried Peppermint leaves — basically a pinch
The Soap Making Process
When I make handmade soap I think of the process in four main parts: Lye water, Solid oils, Liquid oils, and everything that happens at ‘Trace’. Trace is when your oils and lye water react and your mix begins to thicken.
Instructions for this recipe are below but you’ll find even more detailed information in my free 4-part Natural Soap Making for Beginners Series. The 40 minute video at the bottom of the page shows you exactly how this recipe is made.
‘Light Trace’ is the phase when your ingredients change from a liquidy consistency to the thickness of cake batter. ‘Medium Trace’ is when it thickens to a warm custard consistency — I generally always finish working with soap at this stage. ‘Thick Trace’ means your soap is starting to solidify and can be spooned up like thick pudding. With a thick trace you can create textured tops to your bars.
Step 1: Mix your Lye Water
Wearing gloves and eye-protection and in an area with good ventilation mix your lye and water together. Pour all of the lye into the water and then mix with a stainless steel spoon until the lye crystals are dissolved. Next sprinkle in 1/8 of a teaspoon of dried peppermint leaves. These help warm up the colour of your final bars of peppermint soap. Now set the lye water aside to cool — I like to set the jug into a basin of water to speed up the process.
Step 2: Melt your Solid oils
Some oils are solid at room temperature and need to be melted. Just after you mix your lye water begin heating your solid oils in a pan on very low heat. They will fully liquefy in around ten minutes but it’s better to take the oils off the heat when there are a few small pieces of solid oil still floating around. They’ll melt with a few stirs of your spoon/spatula.
Step 3: Check the Lye Water
Take the lye-peppermint-water’s temperature with digital thermometer. You’re aiming for it to be around 120°F / 49°C. If it’s close to that take it out of the water so it stops cooling as quickly.
Step 4: Add your Liquid oils to the Melted oils
You’ve measured all of your liquid oils into another jug. Pour about 1/4 cup of it into a small jar and add the Chromium Green Oxide. This is a mineral colour that will give you a soft green tint. Blend the mineral and oil with a milk frother. When it’s mixed pour it through a strainer and into the pan of melted oils. The strainer helps catch any particles that didn’t blend well.
Add the rest of your liquid oils to the pan and make sure to scrape the jug — Castor oil is thick and likes to stick.
Give the combined oils in the pan a good stir and take its temperature. You’re aiming for it to be within 5 degrees (Fahrenheit) of the temperature of the lye water. Honestly though, if it’s up to ten degrees from it but within the 110-130°F (49-54°C) range you’ll be fine.
Step 5: Bring to ‘Trace’
When your temperatures are right, pour the lye-peppermint-water into the pan of oils. All in one go, no need to dawdle. Next, place your stick blender into the pan at an angle to minimise the air getting into your soap batter via the stick-blender’s head.
Stir the contents of the pan gently, using the stick blender as a spoon. Then bring it into the centre of the pan and while it’s at a standstill, pulse for a couple of seconds. Then gently stir. Repeat this pulse then stir process again and again until the soap thickens up to a ‘Medium Trace’ — the thickness of warm custard.
Step 6: Add Extras
At medium trace add the six drops of grapefruit seed extract, the peppermint essential oil, and the extra 1/8 tsp of dried peppermint leaves. Stir well and until all the leaves and essential oil are well blended.
Step 7: Pour into the Mould
Pour your steadily thickening peppermint soap into your mould(s), cover, and wrap with a towel. Leave for 24 hours before taking the soap out of the mould, cutting it into bars, and allowing to cure for four weeks before using. Curing means you leave it in a place that’s cool, airy, and out of direct sunlight. For full instructions on how to cure handmade soap head over here