What standards cover
Red tea, sold as black tea outside China, is covered by a recommended national product standard.
That means a GB/T number rather than a GB one, and compliance with it is voluntary in principle.
Mandatory GB standards are different, and they cover safety rather than what the tea is like.
The product standard defines the categories, separating the leaf grades from the broken grades used for bags.
Then it sets measurable limits for moisture, ash, water extract and the proportion of fines.
It also gives sensory descriptions for each grade, covering appearance, liquor, aroma, taste and infused leaf.
Contaminants sit in GB 2762 and pesticide residues in GB 2763, and neither is in the product standard.
Labelling is a separate matter again, with its own rules about what may and may not be printed.
Most packaged red tea prints the standard number it was made to, usually near the ingredient list.
That number can be checked in the public standards library, which costs nothing to search.
What they do not cover
A standard will not tell you whether a tea is worth drinking, since that is outside its purpose.
It describes a floor in words, and a tea can clear that floor and still be perfectly ordinary.
Origin is not settled by the product standard, except where a geographical indication standard exists separately.
Terms such as first flush, single estate and high mountain are trade language with no standard meaning.
Nothing in the standard describes how the tea should be brewed, so packet instructions are advice only.
Blending is permitted and normal, so a compliant tea may contain leaf from more than one source.
The sensory checks are done by people, and the same sample can be read differently on another day.
Freshness appears as a shelf life rather than as anything to do with how the tea actually tastes.
Smoked and flavoured red teas sit in a grey area that a general product standard handles unevenly.
Treat the standard as a filter that removes the unacceptable, and your own tasting as the real test.
Grades in practice
Red tea grades separate two things at once: the style of the leaf and the quality within that style.
Broken grades exist for tea bags, and they are not inferior so much as intended for a different job.
Within whole leaf grades, the ranking runs from a special grade down, mostly on appearance and evenness.
More golden tip usually moves a tea up a grade, because it signals young bud material.
The numbers behind the grades barely move, since they are floors rather than targets to aim at.
Grading happens within a lot, so it compares a batch with itself and not with anyone else’s tea.
The producer assigns it, and the result is rarely audited by anybody outside the factory.
Gift boxes lean on grade heavily, because a printed special grade sells better than an honest one.
Buying loose, you may get no grade at all, which is neither a warning nor a reassurance.
Use grade to understand how a lot was sorted, then taste it and make up your own mind.
Safety versus quality
Safety and quality are separate systems in red tea, and the two are easy to confuse when buying.
Mandatory limits sit in GB 2762 for contaminants and GB 2763 for pesticide residues.
The GB/T product standard is voluntary, and a seller may ignore it without breaking any law.
A safe tea can be flat and a fine tea can be sold without a standard number, so read both separately.
Moisture is the number worth watching, because it governs how the tea will keep over the next year.
Water extract tells you roughly how much substance you can expect from the leaf in the cup.
A named producer on the label matters more than any grade, because it gives you someone to ask.
Home residue tests are not dependable, and a negative reading from one of them proves very little.
Ask for a batch test report instead, which most established sellers can produce without any fuss.
Check safety once through the paperwork, then spend the rest of your attention on the taste.
Red tea keeps better than green tea does, but not indefinitely, so a production date alongside the standard number is worth more than either alone.