New York, and Tokyo. Product testing includes variable water qualities, such as water with high copper content, and machine hair brushing. Packaging is also tested for air pressure and leaks. Outside of laboratory work, Wella performs an estimated 37,000 treatments on 3,500 volunteers at test salons annually.

Modern History

Wella relaunched Koleston as Koleston Perfect in 1995 and introduced the TrendVision platform in 2002, which evolved into a hairdressing competition.

Acquisition by Procter & Gamble

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