Goat Milk Soap

Goat Milk Soap

Goat’s milk soap is famous for being mild on the skin and great for people with a sensitivity to chemicals or even regular soap. I make it on a regular basis and it does not take much more effort than regular cold-process soap, so why not give it a go?


Safety: Caustic soda, when added to any liquid increases becomes a strong alkaline solution and will burn when it comes in contact with your skin. You must be very careful not to spill or splash any on you at any time during the soap-making process. If you do get any on your skin, immediately rinse it off in cold running water. Always put on your safety glasses or goggles and your rubber gloves before handling caustic soda. Always add the caustic soda to the liquid and not the liquid to the caustic soda. Even after you have mixed the caustic soda solution in with your oils and have a soap, this soap mixture can still burn you as the saponification process is not complete until the soap is cured and the soap mixture is still very alkaline and can still burn you.


  • Milk that is used in soap-making must be treated first, to prepare it for the soap-making process.  You do this by ensuring that your milk is pasteurized. This is easy if you are purchasing your milk from the grocery store, as this milk will already be pasteurized.
  • The second thing you need to do to the milk is to freeze it. I pre-measure my milk into 280 grams batches and freeze it overnight, taking it out of the freezer in the morning and let it start to thaw out prior to my soap making. I want this milk to be cold and even still partially frozen, like a slushy, when I start to add the caustic soda.  
  • Place your goat’s milk slushy into the container you are going to be using to make your lye solution and then place this container into a sink of cold water and add ice cubes to the water. You want this iced water to reach up to the level of the milk in your container. Be careful not to add too much water, as your container will start to float and may spill.
  • Put on your rubber gloves and your safety goggles. Using accurate kitchen scales, carefully weigh out all of your ingredients.  I measure my caustic soda first, then place it into a small dry bowl. Measure each of your oils and place them all together into your soap pot or stainless steel bowl.
  • Slowly add a small amount of your measured caustic soda to the milk.  As it starts to dissolve, it will start to heat up. Stir the solution gently and then wait for it to cool down. As a rule of thumb, you do not want the solution to get above 38 degrees C.
  • Add some more of your caustic soda, and following the same procedure, wait until the solution cools back down. Continue to do this until you have added all of your caustic soda to your milk.
  • The solution will change colour to a golden yellow as you continue to mix in your caustic soda. This is natural and does not mean that there is anything wrong. This colour will be transferred to your soap. Just be sure that it does not get heated above 38 degrees C, as this will make it much darker and will also produce an offensive smell.


Goat Milk Lye


  • While you are gradually adding the caustic soda to the milk, go ahead and melt your palm and coconut oil. Then add your olive oil which will not need to be melted.
  • Once you have you caustic soda/milk solution made up, and your oils melted, you will need to equalise their temperature until they are the same, somewhere in the range of 34 to 38 degree. To do this use hot and/or cold water in the sink and place the jug and/or bowl into the appropriate water. When they reach the same temperature you are ready to mix them together. You want to have both the oils and the milk/lye solution to be about 37 degrees when you add them together.
  • Once the oils and the caustic coda solution reach the same temperate you are ready to pour your caustic soda solution into your oil mixture. Wearing rubber gloves and your safety glasses slowly drizzle the caustic soda solution into your oils while mixing. If you are going to use a free-standing or hand mixer it should be set at its lowest speed. A free-standing mixer allows you to move away when mixing and avoid getting any small splashes on you. If you are using a handheld mixer or stick blender, be sure you have on long sleeves and rubber gloves and that the bowl is big enough so that you can work without getting splashed. It is faster with a stick blender.


Mixing soap mixture with a stick blender


  • Keep mixing until the soap mixture starts to thicken. As the mixture starts to thicken you need to test for trace.  To test for trace, use a spoon and pick up a small amount of the soap mixture and drizzle it across the top of the remaining soap mixture. If it is not ready, the drizzle will immediately sink back into the soap mixture without leaving a trace. However, as it thickens and you test the mixture again, a small amount of the soap mixture drizzled onto the remaining soap mixture will leave a faint pattern before sinking back into the mixture. This is called trace. You do not want to wait until the trace is thick enough for the pattern to remain on the surface, as this will then be too thick to pour.


Checking for trace


  • Once your soap has reached trace, you are ready to mix in your essential oils and colour. Mix in your essential oils.
  • I have used two colours to get the effect I was looking for. To do this pour about half of the soap mixture into another jug. Then add the colours and mix them in.


Mixing coloured micah into the soap mixture


  • If using silicone soap moulds, place them onto a tray, such as a baking tray. Carefully pour your soap into the mould(s).
  • Begin to pour the soap into the corner of the loaf mould. Then change to the other colour and pour on top of the first colour. Continue to do this, changing colours back and forth until the mould is full.


Pouring the soap batter


  • If the surface is not smooth from when you poured your soap, give them a little shake and they will smooth out. The same applies if you are using some other container as a mould.
  • Cover your soaps with another tray or a cardboard box. Wrap your mould(s) in insulating material such as a blanket or some old towels to keep them warm. Place them in a warm location. I usually use my kitchen, as this is the warmest room in my house.
  • Allow your soap to sit undisturbed for 24 to 48 hours.
  • Check your soaps for firmness. They should be firm to the touch but not rock-hard. If it is still too soft to remove from the mould(s) without damaging the shape of the soap, leave it longer. Once it is firm to the touch, simply pop the soap out of the mould.
  • Cut your soaps to the size you want and place them on a plastic needlepoint screen, sushi mats or something similar to air dry. You want something that will allow air to circulate around the soap. Turn your soap over once a week.
  • Allow your soaps to cure for six weeks before using your soap. This allows for the saponification to be completed.

What you can do is limited only by your imagination. This simple goat’s milk soap smells divine and I love the colour combination and random pattern. You will note that it looked a little thick when I was pouring it into the moulds. In truth, I mixed it just a bit too long as I was trying to get a good photograph of trace. Thinner would have been better.

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