Acid, Aluminum, and Rain: The Soil and Monsoon Behind an Assam Cup

The valley's soil runs strongly acidic and aluminum-heavy, and the monsoon delivers nearly two meters of rain in four months. The compound most articles credit for the malty taste has never actually been tested for it. Here is what the record can, and cannot, certify.

The Cloud in the Cup: Tea Cream as a Strength Test

A strong Assam left to cool turns cloudy, sometimes almost jelly thick. It is not spoiled tea. It is caffeine and the leaf's own strongest compounds falling out of solution, and the trade has used it as a strength test since long before anyone could explain it.

Assam's Caffeine, By Weight and Measure

An average cup of black tea carries about 48 milligrams of caffeine, roughly half of what a cup of coffee holds, and Assam runs toward the strong end of that range. Here is the actual lab measure of Assam's leaf, orthodox against CTC, what changes the dose in your cup, and the 90 to 95 percent decaffeinated version Assam's own research institute has just built.