Mar 19 2009
Homemade Lye From Wood Ash
What is Lye?
Lye is a key ingredient in soap making. It is a strong alkali or base substance which reacts with fat to form soap. You can buy lye in the form of caustic soda (sodium hydroxide) or you can make your own homemade lye in the form of caustic potash (potassium hydroxide).
Firstly lets get the health and safety stuff out of the way. All lye is extremely corrosive. Keep your skin covered, wear goggles to avoid splashes to eyes and definitely keep all lye out of the reach of children and pets. It can be fatal if swallowed.
There, let us proceed…
Lye water can be made at home by leaching water through wood-ash. If you want to do this on a large scale you will need barrels and filters and taps and so on. Here we’re creating homemade lye water on a small scale using what we have to hand. Let me explain:
Making Lye from Wood Ash at Home
- The wood ash should come from burning hardwood.
- Find yourself an old bucket into which you’ve created a few small drainage holes.
- Put a layer of old straw in the bottom of the bucket.
- Now half fill the bucket with wood ash.
- Put your bucket into a larger clean bucket to collect the lye water.
- Pour on some water. Rainwater will keep the whole mixture soft and chemical free.
- Collect the water which leaches through the wood ash, and pour it back over to leach through again.
- Repeat this at least three times over at least three days.
- The resulting liquid will be lye water!
Now the concentration of this lye water will depend on how much water and ash you used as well as what type of wood the ash came from. I am no scientist, we just wanted some lye water. If you need something precise buy some caustic soda as it will tell you its composition on the pack.
But, we can tell if the lye water is the right strength for use in soap making:
Calculating the Strength of Homemade Lye
To check your homemade lye is strong enough to use in soap making at home:
- If a chicken feather dissolves in the lye it is strong enough. If not put the water back through the wood ash to get more concentrated.
- If a fresh egg sinks the lye water is too weak. If the egg floats almost on top of the solution the lye water is too strong and will need to be weakened with additional water. If the fresh egg floats near the top of the solution with a little lye water above it you’ve got a perfect lye water for soap making.
So to make lye at home is a pretty simple process. But that is so long as you don’t mind a ‘rough and ready’ approach to making lye! We think it’s always good to try out free ways of doing things.
Remember homemade lye from wood ash will give a softer soap than that made with commercial caustic soda. We have followed similar recipes for homemade olive oil soap with both commercial caustic soda and homemade lye from wood ash. The wood ash lye soap is a liquid soap which will be good as a hand-wash and hopefully shampoo too. The caustic soda olive oil soap on the other hand is drying hard and will be a general bar of hard soap.
If you have lots of wood ash, making your own homemade lye is a great way to use some of it up!
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Thanks for this info! We’ve talked about doing it and know how “in theory”. It is nice to know someone who actually did it! One of these days I’ll get around to making our own soap!
Kristin – it seems very odd to have made soap from something so ‘dirty’ though!
I didn’t mention that I planned on making soap from home rendered tallow & lard from our own animals one day. So not only would we be rubbing our bodies with something that looks “dirty” to start with, but also with dead animals. It all seems strange…but that’s how it works.
Bizarre isn’t it? I’ll be interested to see how you get on Kristin. I’m guessing it will be a pretty smelly job.
Hey! Something Great to Make out of all our wood stove ashes! We’ve been making lye water without meaning to, leaving buckets of ash outside to cool and then having it rain. Probably should be more careful with it, then, aye?
Thanks for the great tip!
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[...] can of course use homemade lye from wood ash to make your homemade soaps. But, it is far more difficult to gauge the quantities [...]
Why do you boil the lye water down to crystals , then add water back in before using to make soap? You have the right strength if it floats the egg,why not use a measured amount of the liquid?
i burn wood all winter to heat my home..i put the ashes mostly on my garden.. we have for generations… the rain goes thru these endlessly.. at what point.. rainy day can i figure this has turned into lye on the land ?? eventually the rain will delute the lye… my great grandparents had their garden under the ashes & lived into their 90′s & so on thru the times..& the garden grows like anyone elses normally.