ISO 3103 is a standard published by the "International Organization for Standardization (commonly referred to as ISO), specifying a standardized method for "brewing tea, possibly sampled by the standardized methods described in ISO 1839. It was originally laid down in 1980 as BS 6008:1980 by the "British Standards Institution. It was produced by ISO Technical Committee 34 (Food products), Sub-Committee 8 (Tea).
The abstract states the following:
The method consists in extracting of "soluble "substances in dried "tea leaf, containing in a "porcelain or "earthenware pot, by means of freshly "boiling "water, pouring of the liquor into a white porcelain or earthenware bowl, "examination of the "organoleptic properties of the "infused "leaf, and of the liquor with or without "milk, or both.
This standard is not meant to define the proper method for brewing tea, but rather how to document the tea brewing procedure so sensory comparisons can be made. An example of such a test would be a taste-test to establish which "blend of teas to choose for a particular "brand or basic label in order to maintain a consistent tasting brewed drink from harvest to harvest.
The work was the winner of the parodic "Ig Nobel Prize for Literature in 1999.
To maintain consistent results, the following are recommendations given by the standard:
The protocol has been criticized for omitting any mention of prewarming the pot.
In 2003, the "Royal Society of Chemistry published a news release entitled "How to make a Perfect Cup of Tea."