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Polymath 467

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Spriggins | 19:08 Sat 20th Sep 2008 | Crosswords
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Type of organic acid used in the manufacture of phenols, dyes, etc. (US spelling):
?u?e?n?c
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Are you sure of the e - it could be sulfonic
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Thanks Roslyn 251254, I think you're probably right, although I haven't yet worked out what the crossing clue is.

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Polymath 467

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