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Acetaldehyde and acetal concentrations in alcohol-based hand rubs (liquid, samples 1 to 26; gelled, samples 27 to 42) obtained from local and online merchants. The grey and beige colour represent acetaldehyde and acetal, respectively. The black and red dotted line represents the interim Health Canada and United States Pharmacopeia (USP) limit, respectively, on acetaldehyde and acetal concentrations, as of September 2020.
