Inflatable toys and swimming aids, like bathing rings and arm bands, often have a distinctive smell which could indicate that they contain a range of potentially hazardous substances. Some of these compounds, which include carbonyl compounds, cyclohexanone, phenol and isophorone, might be critical when present in higher concentrations in children’s toys, say Christoph Wiedmer and Andrea Buettner, who are authors of a study in the journal Analytical and Bioanalytical Chemistry..