DIY Charcoal & Beer Soap – Detoxifying Cold Process Recipe

There’s something delightfully cheeky about making soap with beer, isn’t there? It feels a bit rebellious—like you’ve raided the fridge and turned happy hour into skincare. But behind the fun is a power-packed bar that’s brilliant for the skin.
This DIY Charcoal & Beer Cold Process Soap combines deep-cleansing activated charcoal with the bubbly richness of flat beer, creating a rustic bar that detoxifies, nourishes, and smells subtly earthy. It’s perfect for gifting, great for oily skin, and has that rugged edge men actually like (and use).

Get more details about this project

What you need

This recipe makes approx. 6–8 bars depending on your mold.

Base Oils:

• 300g Olive Oil 
• 250g Coconut Oil 
• 200g Palm Oil (sustainably sourced) 
• 150g Castor Oil 
• 100g Shea Butter 

Lye Solution:

• 130g Sodium Hydroxide (Lye) 
• 300g flat beer, frozen into ice cubes 

Important: Always run your formula through a soap calculator if adjusting quantities.

Additives:

• 2 tbsp Activated Charcoal Powder 
• 1 tsp Kaolin Clay (for slip and silkiness) – optional 
• 30g Essential Oil Blend (try cedarwood + orange or patchouli + peppermint) 

Preparing the Beer Safely

Soapmaking with beer takes a little prep to avoid… let’s say, volcanic situations.

1. Open your beer the night before and pour it into a wide dish. Let it go flat to reduce carbonation. 
2. Freeze the flat beer in an ice cube tray. This helps control the heat when you add the lye. 
3. Wear gloves, goggles, and patience. When adding lye to beer, go slowly. Stir continuously and expect a strong scent—it mellows later. 

Instructions

How to Make Beer & Charcoal Cold Process Soap

Step 1: Prep Everything

Line your mold, measure all your oils, and get your additives ready. Have your charcoal and clay in a small bowl.

Step 2: Make Your Lye Solution

Wearing full safety gear, slowly sprinkle the lye into the frozen beer cubes, stirring until fully dissolved. It will heat up quickly and may smell a bit funky. Let this cool to around 38–43°C.

Step 3: Heat & Combine Oils

Melt your solid oils first, then stir in the liquid oils. Let them cool to a similar temp as your lye solution.

Step 4: Blend

Pour the lye solution into the oils and stick blend to a light trace.

Step 5: Add Charcoal & Essential Oils

Whisk in the charcoal, clay, and essential oils. Don’t overblend—just stir until incorporated.

Step 6: Pour Into Mold

Pour your batter into the mold. Tap it gently to release air bubbles. You can swirl the top with a spoon or sprinkle dried hops or oats for texture.

Step 7: Insulate and Saponify

Cover and insulate your mold for 24 hours. Check it after 12 hours to make sure it’s not overheating (beer soap can be feisty!).

Step 8: Unmold and Cure

Unmold after 1–2 days, slice, and let cure for 4–6 weeks. The smell will mellow into something wonderfully woodsy.

Tips & Variations

• Swap the beer: Stouts give a darker colour and richer scent, but pale ales or craft IPAs can be fun too. 
• Add exfoliants: Poppy seeds or ground oats add scrubby texture. 
• Layer it up: Try a swirl technique by splitting the batch—half with charcoal, half plain. 

Gifting Ideas

Wrap your bars in kraft paper with a simple “Man Soap” label or tie on a tag that says “Cheers to Clean!”—perfect for Father’s Day, beer-loving mates, or cheeky Christmas stockings.

Beer soap isn’t just a novelty—it’s a luxurious, high-lathering bar that feels fancy and rustic all at once. Add charcoal to the mix, and it becomes a hardworking detox soap with a bit of masculine flair (even if you secretly keep a bar for yourself… no judgment).

Try it once, and you’ll be hooked. Just don’t forget to hide the good beer for your next batch!