P-29, r. 1 - Regulation respecting food

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10.3.1.31. Wood or sawdust used to produce smoke for smoking freshwater products:
(1)  may not derive from softwood species;
(2)  may not have been treated with a chemical preservative or contain glue, paint, varnish or any other chemical.
O.C. 1305-93, s. 28.