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Using Fresh Goat's Milk in Soap
Ice Bath for Lye Solution
The main challenge using fresh goat's milk in place of water in your lye solution is that as the lye heats up, it carmelizes the sugars in the milk, turning it a bright orange color. The soap ends up being a light orange-amber color. Most people prefer a whiter soap, so they go through a few steps to minimize the orange color.
The main way is to keep the lye solution cool as you're mixing it. Start by putting your lye pitcher into a large bowl of ice water. This ice bath will help keep the solution cool as you're mixing it.