PARIS — Robertet, a leader in natural raw materials for fragrances, flavors and active ingredients, is adding plant-based biotechnologies to its repertoire with an investment in Aethera Biotech. Financial terms of the deal were not disclosed, but the investment is to be completed in two phases over three years, contingent on certain, undisclosed market conditions. In the long term, a joint venture will be 50-50 owned by the two groups. More from WWD Faced with ever-mounting concerns about environmental a ...