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Rooibos tea does not contain caffeine [10] [11] and has low tannin levels compared to black tea or green tea. [9] Rooibos contains polyphenols, including flavanols, flavones, flavanones, dihydrochalcones, [12] [13] aspalathin [14] and nothofagin. [15] The processed leaves and stems contain benzoic and cinnamic acids. [16]
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The etymology of the various words for tea reflects the history of transmission of tea drinking culture and trade from China to countries around the world. [14] Nearly all of the words for tea worldwide fall into three broad groups: te, cha and chai, present in English as tea, cha or char, and chai.
The term "herbal" tea is often used to distinguish these beverages from "true" teas (e.g., black, green, white, yellow, oolong), which are prepared from the cured leaves of the tea plant, Camellia sinensis. Unlike true teas, most tisanes do not naturally contain caffeine (though tea can be decaffeinated, i.e., processed to remove caffeine). [4] [5]
In the western black tea industry, tea leaf grading is the process of evaluating products based on the quality and condition of the tea leaves themselves. The highest grades are referred to as "orange pekoe", and the lowest as "fannings" or "dust". This grading system is based upon the size of processed and dried black tea leaves.
The tea industry uses the term orange pekoe to describe a basic, medium-grade black tea consisting of many whole tea leaves of a specific size; [6] however, it is popular in some regions (such as North America) to use the term as a description of any generic black tea (though it is often described to the consumer as a specific variety of black ...
Crush, tear, curl (sometimes cut, tear, curl) is a method of processing tea leaves into black tea in which the leaves are passed through a series of cylindrical rollers with hundreds of sharp teeth that crush, tear, and curl the tea into small, hard pellets. This replaces the final stage of orthodox tea manufacture, in which the leaves are ...