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Pure Castile (100% Olive Oil) Recipe

Beginner

Traditional Castile soap using only olive oil. Extremely gentle with a creamy, lotion-like lather. Requires extended cure time but produces a luxurious bar.

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The calculator works out the lye and water for your batch size, lye concentration, and superfat. Those amounts are not printed here on purpose: they change with every one of those settings.

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Oil blend

OilPercent of oilsType
Olive Oil100%Soft oil
Superfat7%Oil left unsaponified for mildness

Percentages are by weight of the total oils. Each oil links to its reference page with SAP value, fatty acid profile, and substitutes.

Predicted bar properties

Hardness
1729 to 54
Cleansing
012 to 22
Conditioning
8244 to 69
Bubbly lather
014 to 46
Creamy lather
1716 to 48
Iodine 85
INS 105
Saturated 17%
Unsaturated 82%

Predicted from the fatty acid profile of the oils, the same way the calculator scores a recipe. The right-hand figures are the usual cold process ranges; green bars fall inside them.

Reading the numbers

  • β€’Cleansing is 0, below the usual 12 to 22 range. Expect a mild bar with a lower, lotion-like lather rather than big bubbles.
  • β€’Hardness is 17, under the 29 to 54 range. The bar will be soft at unmolding and needs a longer cure to firm up.
  • β€’Conditioning is high at 82. Skin feel is the point of this blend; the trade is a slower trace and longer cure.
  • β€’Iodine is 85. Above 70 the bar is more prone to softness and dreaded orange spots, so use fresh oils and cure it well.

Making it

Slow trace. Unmold after 3-5 days. Cure 6-12 months for best results. Gets harder and milder with age.

Run every batch through the calculator and weigh oils, lye, and water on a digital scale. Never use lye amounts from memory or from a different batch size. Read the lye safety guide before your first pour.

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