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12 bars of Soap

Swirl Buttermilk Castile Soap Project

This is one of our favorite recipes from Bramble Berry CEO and Founder Anne-Marie's new book, Milk Soaps.
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Additional Information

  • Description
  • Supplies
  • Instructions
  • Reviews
  • Q&A

Description

This gentle recipe is from Bramble Berry CEO and Founder Anne-Marie's new book, Milk Soaps. It's made with 100% olive oil, making it a true castile bar (made famous in Spain and prized for its kindness to sensitive skin. Homemade buttermilk is best; if you buy it, use a brand with as few additives as possible.

The colorant comes from dried madder root, a climbing plant with pale yellow flowers. The lavender-and-peppermint essential oil blend smells amazing. The soap is designed with an in-the-pot swirl and finished with beveled edges.

This mold is large and flexible, so a cutting board placed under it will be handy if you need to move the soaps after pouring. The bars need extra cure and hardening time thanks to the large amount of olive oil in the recipe.

Photos by © Charity Burggraaf. Excerpted from Milk Soaps © by Anne-Marie Faiola. Used with permission from Storey Publishing.

  • Skill Level: Beginner

  • Time to Complete: 1 hour

  • Kit Yields: 12 bars of soap

Supplies

6 Ingredients
1 Tools
9 Items From Home
For All 7 Items
For All 7 Items
6 Ingredients
6 Items
$67.37
We do our best to include just what you need to make your project, however due to available product sizes, you may have left overs.
Olive Oil - Pure - 1 lb
Olive Oil - Pure - 1 lb Item#:IB002448
Varient/Quantity/Set: 0
size: 1 lb
Price: $6.49

$19.47
Sodium Hydroxide Lye
Sodium Hydroxide Lye Item#:IB002149
Varient/Quantity/Set: 0
variant-quantity-set: 1 - 32 oz jar
Price: $10.00

$10.00
Sodium Lactate - 4 oz
Sodium Lactate - 4 oz Item#:IB002096
Varient/Quantity/Set: 0
size: 4 oz
Price: $2.00

$2.00
Lavender 40/42 Essential Oil - 3.5 oz
Lavender 40/42 Essential Oil - 3.5 oz Item#:IB000267
Varient/Quantity/Set: 0
size: 3.5 oz
Price: $18.65

$18.65
Peppermint Essential Oil, 2nd Distill - 1.75 oz
Peppermint Essential Oil, 2nd Distill - 1.75 oz Item#:IB000226
Varient/Quantity/Set: 0
size: 1.75 oz
Price: $11.25

$11.25
Madder Root - 3 oz
Madder Root - 3 oz Item#:IB002153
Varient/Quantity/Set: 0
size: 3 oz
Price: $6.00

$6.00
1 Tools
1 Items
$13.49
12 Bar Square Silicone Mold - 1 mold
12 Bar Square Silicone Mold - 1 mold Item#:IB002735
Varient/Quantity/Set: 0
variant-quantity-set: 1
Price: $13.49

$13.49
OTHER ITEM'S YOU'LL NEED

6.6 oz. Distilled Water
6.6 oz. Liquid Buttermilk
2 Large Heat-Proof Bowls
2 Small Heat-Proof Bowls
Cutting Board
Whisk
Silicone Spatula
White Stick Blender
Soap Beveller

Instructions

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Swirl Buttermilk Castile Soap Project
This gentle recipe is made with 100% olive oil and buttermilk.

Ingredients

12 Bar Square Silicone Mold
40 oz. Pure Olive Oil
5.2 oz. Lye
1 Tbsp. Sodium Lactate
1.9 oz. Lavender 40/42 Essential Oil
1 oz. Peppermint Essential Oil, 2nd Distill
1 Tbsp. Madder Root
6.6 oz. Liquid Buttermilk
6.6 oz. Distilled Water

Instructions

1 Measure 40 ounces of olive oil into a glass bowl large enough to hold the full recipe with room to mix. Heat the oil to 105° F and set aside. 
2 Measure 6.6 ounces of distilled water and 5.2 ounces of lye into separate heat-proof containers. Add the lye to the water a tablespoon at a time (never add the liquid to the lye). Stir continuously until the lye fully dissolves and the water becomes clear. Stir 1 Tbsp. of sodium lactate into the lye water.
3 When the oil and the lye water have cooled to about 105° F, add the lye water to the oils, pouring it over the shaft of the stick blender to minimize air bubbles.
4 Insert the stick blender into the batter, tilting it so that trapped air can escape. Do not turn on the stick blender until the blades are fully immersed. Alternate pulsing and stirring with the stick blender until a very thin trace is achieved.
5 Add 6.6 ounces of buttermilk, 1.9 ounces of lavender essential oil, and 1 ounce of peppermint essential oil. Stir in with a whisk.
6

Pour 20 ounces of uncolored batter into the second bowl and add 1 Tbsp. of madder root. Mix well with a whisk.

pour batter

7

Pour the colored batter back into the first bowl. Pour from serveral inches above the bowl, using a circular motion so that the two batters swirl together.

pour and mix

8

Stir the swirled batter one time with a spatula. Do not overmix the swirl.

swirled batter

9

Fill the mold by pouring into a corner of each cavity. Pour into the same spot until the entire cavity is full; do not move the bowl around as you pour.

fill mold

10

Spray thoroughly with 99% rubbing alcohol several times over 90 minutes to prevent soda ash. Let the soap sit at room temperature for at least 48 hours before unmolding. Once the soaps are unmolded, let them sit another 24 hours before beveling the top four edges of the bars. Let the bars cure in a well-ventilated area for at least 6 weeks before using, turning them every few days to ensure they cure evenly. Note: The madder root will lighten as the soap cures.

final step

Tutorial credits

Photos by © Charity Burggraaf. Excerpted from Milk Soaps © by Anne-Marie Faiola. Used with permission from Storey Publishing.

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