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In page Barley wine:

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The two primary styles of barley wine are the American, which tends to be hoppier and more bitter, with colours ranging from amber to light brown[2] and the English style, which tends to be less bitter and may have little hop flavour, with more variety in colour ranging from red-gold to opaque black.[3][4] Until the introduction of an amber-coloured barley wine under the name Gold Label by the Sheffield brewery Tennant's in 1951[5] (later brewed by Whitbread), British barley wines were always dark in colour.[citation needed]