Tree moss has been in the news for featuring on a new list of ingredients which may cause allergies and perfumes such as Chanel No 5 contain traces of it.

BBC: Quiz of the week's news

Hollywood actor Brad Pitt is the current face of a campaign for the women's fragrance Chanel No 5, while actress Keira Knightley fronts an advert for the label's Coco Mademoiselle perfume.

BBC: Linlithgow Palace hosts Chanel fashion show

That's what's spent on olfactory ingredients in Tide detergent, Palmolive soap, Chanel No. 5 and a host of other aromatic products.

FORBES: The scent of money