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c1450 Middle Eng. Med. Bk. (Heinrich) 134 Take harde spaynessh sepe and a litul stale ale.

1572 G. Gascoigne Councell to Withipoll 78 Some may present thee with a pounde or twaine Of Spanishe soape to washe thy lynnen white.

1774 W. Buchan Domest. Med. (ed. 3) xliii. 492 Such as cannot bear the asafœtida may substitute Spanish soap in its place.

1870 J. Yeats Nat. Hist. Commerce 206 Spanish or Castile soap is made by mixing olive oil and soda.