S-13, r. 4 - Regulation respecting cider and other apple-based alcoholic beverages

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6. If potassium ferrocyanide is used in the production of an alcoholic beverage, there must remain no trace of the substance after the treatment.
The holder must, within 10 days after using the substance, have the production lot of the alcoholic beverage tested by a member of the Ordre des chimistes du Québec for the presence of potassium ferrocyanide and send the professional’s analysis report to the Régie des alcools, des courses et des jeux.
O.C. 1096-2008, s. 6.