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A bottle with lye and a pitcher with water

Soap Making Lye Water

Learn how to make lye water for soap making! As one of the most important – and dangerous – steps in soap making, and because it’s common to all soapmaking processes, I’ve decided to make a single post just to let you know how to make lye water for soap, safely and without any concerns.
Prep Time: 10 minutes
Total Time: 10 minutes
Method: Soap Making
Cosmetic: Lye Water For Soap Making
Servings: 1 jug of lye water
Author: Sofia Matias

Equipment

Ingredients

Instructions

How To Make Lye Water

  • Make your lye water prefferably outdoors, or at least, near an open window.
    add-salt-to-lye-water
  • Weight the lye/potash and water according to each recipe. Don't make errors above 1 gram.
    measuring-lye
  • Pour the lye/potash in the water. NEVER pour the water into the lye/potash, you may get a "volcano" effect or lye spilling.
  • Mix well with a silicone spatula or spoon. Don't breathe the vapours, they are very irritating.
  • When using potash, the reaction potash-water is even stronger than lye-water. Be ready for cracklings and a very slight volcano.
    Ingredients and jars to prepare lye water with potassium hydroxide
  • Be careful as the jug will get a really high temperature (near 90ºC - 100ºC or 194ºF - 212 ºF).
    lye water
  • For cold process, it is important to check temperature, in order to mix it with oils at a good temperature.
    measuring-lye-water-temperature

Variants

  • Basic lye water only uses lye/potash and distilled water. But you can make lye water replacing the water with any water-based liquid: herbal infusions, vegetable pureés, fruit juice, milk, coffee, even beer.
    lye-water-made-with-orange-juice
  • Some addictives to improve soap properties are also added to the lye water, especially ones that will react with lye or potash: sodium lactate, fine salt, citric acid, vinegar.
    lye-water-with-sodium-lactate
  • You can also add the ingredients we will be using as natural colorants: clays, spices, dried herbs in powder form.
    green lye water

Video

Tried this recipe?Send a pic to @herbalcochete!