Lady Gaga refused to sign a fragrance deal with cosmetics firm Coty Beauty unless bosses could find a way to create the world's first-ever black perfume.
The pop star wanted to find a way to make her own fragrance, titled Fame, from a black liquid which, when sprayed, becomes clear - and she was determined to make a product that fans and critics alike would be in awe of.
"I raised an eyebrow. I didn't really want to do it at first. But I wanted to create a fragrance that somebody who makes fragrances says, 'Well, how did they do that?' And of course, once it smelled so good everyone said, 'Can't we just make it clear so we don't have to explain to people that it won't get on your clothes?' Gaga has told Vogue magazine.
"I said, 'No. The fragrance is called Fame; it must be black. It must smell enticing. You must want to lick and touch and feel it, but the look of it must terrify you."'
However, Gaga's innovative ideas caused headaches for the company's research and development team.