/oss/taxonomy/term/2106/all en /oss/article/environment-health/colourful-thoughts <p><span>I am no alarmist when it comes to "artificial chemicals" used in food or cosmetic production. But I do question the use of colourants because they have no function other than changing the appearance of a product. Why do we need mouthwash to be blue? It's because somehow people have been conditioned to associate blue with cleanliness, which is why window cleaners, toilet bowl cleaners and mouthwashes are blue.</span></p> Sat, 13 Feb 2016 01:04:34 +0000 Joe Schwarcz PhD 2316 at /oss