One of the most unusual standards is ISO 3103. It is about how to get a cup of perfect tea.

The eight-page standard defines the size, material and shape of the teapot, the proportion of water, the time of infusion, the addition of milk, and more. First published in 1980, and revised in 2019.

Despite the fact that the attitude to the standard is very ironic, – he even turned out to be the winner of the 1999 Nobel Prize – the method of brewing tea according to ISO 3103 is important for laboratories and allows you to establish a unique taste of the tea brand regardless of the crop.