Watermelon Soap
Cold Process Ingredients: For 1kg Caustic Soda- 125g Water- 340g Olive Oil- 454g Coconut Oil- 284g Palm Oil – 170g ¼ tsp Grapefruit seed extract Water Dispersible Red Liquid Colour Green Liquid Colour Yellow Liquid colour White Titanium Dioxide 20 ml Essential oil / Fragrance Poppy Seeds
2/3rds of the Ingredients: Caustic Soda- 85g Water- 226g Olive Oil- 302g Coconut Oil- 165g Palm Oil – 113g 1/3rds of the Ingredients: Caustic Soda- 41g Water- 113g Olive Oil- 151g Coconut Oil- 94g Palm Oil – 56g
Equipment: Scales (1g increments) Jugs (heat resistant plastic or Pyrex) Whisk (hand whisk) Stainless Steel Pans Measuring Spoons Goggles or Safety Glasses Rubber Gloves 1kg Mould Siliconised baking sheet to line your mould (folded, not cut)
1. Firstly, line a wooden mould with the siliconised grease proof paper. When you have lined your mould fill a bowl with cold water ready for cooling the lye. (Do not over fill it as you don’t want the jug of lye to float but just sit in the water comfortably to cool).
2. Measure out the 2/3rds quantities of water and caustic soda into separate jugs, making sure you’re wearing the correct safety equipment such as gloves and googles. Mix the caustic soda into the water, all at once and whisk straight away. It will begin to react to create your lye, DO NOT breathe in the steam. Make sure you mix your lye in a spacious area or near to a window just to be sure. Once mixed together, place the jug into the bowl of cold water to cool.
3. Again measure out the 2/3rds quantities of olive oil, coconut oil and palm oil into a stainless steel pan. Most people won’t have all the oils already melted so you will just need to melt down the pre weigh oils in separate pans and then add all together in one larger pan. *The reason why this recipe has been split into 2/3rds and 1/3rd is due to the layering technique used to create the different colours and sections of the watermelon soap. The red poppy seed infused bottom of the soap needs time to gel and stiffen before pouring the white and green layers on. This is a really easy way to create exact and interesting layers in your soap loaves. 4. Add a few drops of grapefruit seed extract and whisk all the oils together; the grapefruit seed extract will bead up slightly but this will not affect your soap.
5. When your lye has cooled down slightly add it in all at once to your oils and whisk immediately. Continue to whisk until you find a trace.
6. Once you begin to see a *trace you can add your chosen oils or fragrances. Be careful to test and check what oils and fragrances work in cold process soaps as some do and some don’t, it’s always worth testing before you waste a whole batch of soap if it goes wrong. Before I tried this soap I tested the Watermelon Fragrance we stock here at The Soap Kitchen and it DOES NOT WORK!! Unless you want porridge like mess for soap do not use this. I have yet to find a watermelon fragrance that does work so instead I used Rose Geranium essential oil to be on the safe side.
*Trace- A trace is what you look for when your soap is ready to add oils or colour to then pour into the mould. We like to describe it as looking like a hair sat on top of the mixture or like someone has scored a knife through the soap mix. Once you’ve recognised a trace you’ll have no problem with finding one again. 7) Once you’ve found the trace add the water dispersible red until you achieve a deep reddy pink that you are happy with. 8) Then for some texture, and to look like the watermelon seeds, we added poppy seeds to our 2/3rds of soap mix. Add as much or as little as you wish. 9) When you are happy with the colour and look of your mix, pour it into your lined mould. Cover with a top and some towels to keep in the warmth and then leave to gel. For this particular loaf we want the soap to gel enough so we can then make the rest of the 1/3rd mix for the white and green top. 10) After you have left the 2/3rds of soap to gel you can begin to make the white and green top of your watermelon soap. Using the same process as before, measure out the rest of the 1/3rd soap mix ingredients. 11) You will need 2 jugs ready for this last bit as you are splitting the mixture again for the separate white and green layers. I chose to make the white layer slightly less than the green so had more in the green jug than the white. 12) After splitting your soap mixture, colour the white one with white titanium dioxide. This is a powder that will need mixing slightly with some water to create a paste to help mix in to your soap. Mix in the colour and then pour on top of the red gelled soap from before. 13) Partially re-cover the mould to avoid the soap losing too much heat too quickly and then begin to colour your green mix. 14) Because we need the white layer to gel slightly before pouring the green layer on top, keep the mixture moving slowly for about 20 – 30 minutes to help it thicken up and allow time for the white to gel. When you are happy the white layer has gelled enough to create an even layer pour over the green soap mix. For an added bit of fun I left a small amount of green in the jug and coloured it a darker green. I then used this to pour stripes of dark green long the length of the loaf to make it look like a watermelon skin!













