International Standard for Brewing a Cup of Tea – ISO 3103

Tea can be brewed in a variety of ways.

If you’re looking for a method to brew a very consistent cup of tea, then you could try the ISO 3103 international guidelines for brewing a cup of tea.

While I don’t personally use this method, I do recognize that it’s important to have standards in place, and I appreciate the work done by the International Organization for Standardization.

To brew a consistent cup of tea, the ISO 3103 guidelines recommend the following standards:

  • The pot should be white porcelain or glazed earthenware and have a partly serrated edge.
    It should have a lid that fits loosely inside the pot.
  • If a large pot is used, it should hold a maximum of 310 ml (±8 ml) and must weigh 200 g (±10 g).
  • If a small pot is used, it should hold a maximum of 150 ml (±4 ml) and must weigh 118 g (±10 g).
  • 2 grams of tea (measured to ±2% accuracy) per 100 ml boiling water is placed into the pot.
  • Freshly boiling water is poured into the pot to within 4–6 mm of the brim.
    Allow 20 seconds for water to cool.
  • The water should be similar to the drinking water where the tea will be consumed.
  • Brewing time is six minutes.
  • The brewed tea is then poured into a white porcelain or glazed earthenware bowl.
  • If a large bowl is used, it must have a capacity of 380 ml and weigh 200 g (±20 g).
  • If a small bowl is used, it must have a capacity of 200 ml and weigh 105 g (±20 g).
  • If the test involves milk, then it is added to the bowl before pouring the infused tea into it, unless that is contrary to the organization’s normal practice.
  • If milk is added after the pouring of tea, the standard notes that best results are obtained when the liquid is between 65 and 80 °C.
  • 5 ml of milk for the large bowl, or 2.5 ml for the small bowl, is used.

This list of standards was found on Wikipedia.

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