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For example, where esters are often "fruity" and hexyl compounds are often "green," umami is not "fruity" or "green."

The shallow waters above swim with fragrance chemicals, chiefly amyl and hexyl salicylate, which are commonly used in soap, hair spray and fabric conditioner for their ‘floral and herbal odour’.

Savvy consumers should look for octocrylene in the “active ingredient” list of their sunscreen or ethyl­hexyl methoxycrylene as an “other ingredient.”

Wintek has said it used hexyl hydride, also called n-hexane, from May 2008 to August 2009, but stopped after discovering it was making workers ill.

Wintek, owner of the factory in east China's Suzhou industrial park, said it has reserved 10 million yuan for compensation to the workers affected by the chemical hexyl hydride, and will pay more if the illness continues.