I've wanted to try this ever since I saw Fight Club! I've seen several methods for making soap, but I'm always attracted to using dangerous chemicals, so lye seemed the obvious way to go.
Lye, sodium hydroxide, is an incredibly caustic chemical with a bad boy reputation for removing fingerprints and dissolving corpses. During the second world war, Leonarda Cianciulli liquidised three victims in Italy using the stuff, and Santiago Meza López, "The Stewmaker", claims to have disposed of 300 bodies with it.
I decided to make a floral lavender soap and a macho coffee soap inspired by The Art of Manliness. They say that coffee soap is very good for cleaning harsh smells from your hands.
I used The Sage to get the right quantities of oil, water and lye, and off I went!
You'll also need:
- Eye protection, a face mask and gloves - I can't overstate how dangerous lye is
- 1 litre of vinegar - in case you spill lye on yourself you'll need to neutralise it really quickly
- Bowls and stirring tools that aren't aluminium or wood - lye will eat through these
- A stick blender - it reduces the stirring time from an hour to 5-10 minutes
- Moulds to pour the soap into - I used four old takeaway containers with lids
- Towels to wrap the moulds
The pictures are all from the lavender soap, but it's the same process for making the coffee version.
First you'll need to make the lye solution. Put on all your protective gear. Mixing lye with water is extremely exothermic, and so it's really important to add the lye crystals to the water and not the other way around! If you're making the coffee version, wait for the espressos too cool, then mix with the water. Make sure you've got 286ml of liquid in total.
Do this outside as the fumes are really nasty, and add the crystals bit by bit, stirring continually. By the time I'd added all the lye, the water had jumped from 10°C to 95°C. You really don't want it to boil.
Now you need that to cool down to 50°C maximum, so leave it outside and heat the oil to about 50°C as well. Once the lye has cooled, pour it gently into the oil and gently mix together. Add the ground lavender and the lavender oil, plus the colour if you're using it, then blend with the stick blender for 5-10 minutes until it's the consistency of thick custard.
Pour some of the lavender flowers into the bottom of the moulds, then add the gloopy soap, seal the moulds and wrap in towels to keep the heat in. Leave for 24 hours for the soap to set.
The next day, pop the soap out of the moulds, cut them up and leave to cure for 6-8 weeks. This allows all the lye to react with all the oil to make soap, called saponification.
Here's a short video I made of the process:
In ten days we're leaving the UK for new adventures in Spain...Read more
Archive2016December 2016 (2)November 2016 (2)October 2016 (2)September 2016 (3)August 2016 (4)July 2016 (5)June 2016 (4)May 2016 (4)April 2016 (5)March 2016 (4)February 2016 (4)January 2016 (5)2015December 2015 (4)November 2015 (4)October 2015 (5)September 2015 (4)August 2015 (4)July 2015 (4)June 2015 (4)May 2015 (5)April 2015 (4)March 2015 (4)February 2015 (4)January 2015 (4)
What's this about?
Hi I'm Mat and I'm addicted to new hobbies. I used to think this was a bad thing but now I'm embracing it.
Writing them all up in this blog encourages me to finish projects, and helps me keep track of which ones I've tried.
I've just had my first go at copper refining from some old scrap copper pipe, and it's really really hot...
Also in Making things...
I'm still obsessed with poker and a bit sad that Kat doesn't enjoy the game at all...