This section is from the "A Complete Dictionary of Dry Goods" book, by George S. Cole. Also available from Amazon: A complete dictionary of dry goods and history of silk, cotton, linen, wool and other fibrous substances,: Including a full explanation of the modern processes ... together with various useful tables.
Burl. To pick knots, loose threads, burrs, etc. from, as in finishing cloth. To cleanse cloth, as with fuller's earth or a similar substance.
 
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