Advent International to Bid $4 Billion for Unilever | India May Halt Imports of Nepal Tea | The Physics of Tea Scum

HEAR THE HEADLINES – Advent International Will Bid $4 Billion for Unilever’s Tea Portfolio | India Considers Halting Imports of Nepal Tea

| Sales of Herbal Supplements in the US Reached a Record $10 Billion in 2020

| NEWSMAKER – Rainforest Alliance Director South Asia Madhuri Nanda 

| GUEST – Caroline Giacomin, Ph.D., a physicist at ETH Zürich, Switzerland  

| FEATURES – This week, Tea Biz travels to Switzerland to learn from ETH Zürich physicist Caroline Giacomin the physics of that colorful sheen that rises to the surface of black tea. Is tea scum just that or a revealing indication of goodness in the cup? … and then we travel to New Delhi, India, where the Rainforest Alliance’s Madhuri Nanda reveals how practitioners of RA’s sustainable farming methods are evolving toward broader, more holistic ecosystems in Part 2 of our series on Regenerative Agriculture.

The Physics of Black Tea Film

Have you ever noticed a colorful sheen on the surface of your tea? It appears to break like ice floes in the Arctic as the tea cools. Researchers once thought tea film was due to waxy substances contained in tea leaves released during steeping. That is not the case. The delicate film is an interfacial interaction of air, tea polyphenols, and calcium carbonate ions in water. It does not form on white, yellow, green, or lightly processed oolong teas; it is only black tea. Soft water in many parts of the world prevents the film from forming. Is tea film a fleeting glimmer of color to enjoy or an ugly scum to quickly dissipate with a squeeze of lemon? Caroline Giacomin, Ph.D., a physicist at ETH Zürich, Switzerland, joins us to explain the physics of tea film from a study she and colleague Peter Fischer recently published in the Physics of Fluids. 

Regenerative Agriculture: A Holistic Approach

The Rainforest Alliance's Madhuri Nanda explains that while sustainable farming ensures that agricultural practices do not negatively impact and degrade the environmental, social, and economic aspects of the surrounding ecosystem ̶ the focus shifts in regenerative agriculture toward adopting a broader holistic approach that enhances biodiversity and improves soil health through increased microbial activities that build resilient systems capable of withstanding adverse climatic scenarios."

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