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According to some authorities, Castile soap originated in the Kingdom Of Castile , where it was made from olive oil only; importations of "Castile soap" through Antwerp appear in the London port books of 1567–68 (Dietz 1972), though the '' OED '' could find no earlier reference to "Castile soap" than 1616. In Castile, the fine sifted alkaline ash of '' Salsola '' species of thistle, called ''barilla'', was boiled with locally available olive oil, instead of Tallow . By adding salty brine to the boiled liquor, the soap was made to float to the surface, where it could be skimmed off by the soap-boiler, leaving the excess Lye and impurities to settle out. This produced what was probably the first white hard soap, which hardened further as it was aged, without losing its whiteness, forming ''jabon de Castila'', which eventually became the generic name. To an Apothecary it was known as ''sapo hispaniensis'' or ''sapo castilliensis'' {Link without Title} . The fine ashes used in soap-making were so valuable that they were shipped to England from Massachusetts in the 17th century. The British Parliament decided to permit free importation of some products used in linen manufacture in 1803, when the war was creating scarcity: among the ingredients to come free of excise were "wood and weed-ashes, pot pearl ashes, barilla..." {Link without Title} Another theory is that modern-day castile soaps are conceptually similar to, and most likely derived from the so-called white soap that has traditionally been manufactured in Northern Italy since the early 1600s . From Venice , where the oldest white soap factories were established, olive oil-based soap reached the Greek island of Crete first, and Southern France ( Marseille ) at a later stage. There is no verifiable historical mention of older soap factories in Spain. It is therefore possible that the term Castile, when applied to soap, might either refer to modern soap factories in Spain, or to the geographical location of the ports where white (''castile'') soap was collected before crossing the Atlantic on its way to the Americas. EXTERNAL LINKS REFERENCES
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