There's an ISO standard for how to brew tea for laboratory comparison: https://en.wikipedia.org/wiki/ISO_3103 https://en.wikipedia.org/wiki/ISO_3103 Also here

There's an ISO standard for how to brew tea for laboratory comparison: https://en.wikipedia.org/wiki/ISO_3103 https://en.wikipedia.org/wiki/ISO_3103 Also here are all the ISO standards for coffee: https://www.iso.org/committee/47950/x/catalogue/p/1/u/0/w/0/d/0 https://www.iso.org/committee/47950/x/catalogue/p/1/u/0/w/0/... They don't yet have any brewing standards but a lot of what they seem to do is by nose with green or roasted ground coffee.