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In page Soap:
"The type of alkali metal used determines the kind of soap product. Sodium soaps, prepared from sodium hydroxide (soda lye), are firm, whereas potassium soaps, derived from potassium hydroxide (potash lye), are softer or often liquid. Historically, potassium hydroxide was extracted from the ashes of bracken or other plants. Lithium soaps also tend to be hard and are used almost exclusively in greases.[citation needed]
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