Where the four fractions come from
They are separated after manufacture by sifting. Finished orthodox tea is passed over a series of meshes, and what remains on the coarsest mesh is whole leaf, what falls through progressively finer meshes is broken leaf, then fannings, then dust. Some breakage is inherent in rolling and handling; some is deliberate, since a factory selling into a bagged-tea market will size its manufacture accordingly. The important structural point is that all four fractions can come from the same day’s leaf. The dust in a factory’s output is not the poor tea and the whole leaf the good tea; they are the small pieces and the large pieces of the same production. Quality was determined earlier, in the plucking and in the handling of the wither, oxidation and firing, and the sifting merely sorts what came out. Sorting also serves a second purpose beyond size, which is the removal of unwanted material. Winnowing and density separation take out stem, fibre and dust that would otherwise reach the packet, and in some factories electrostatic or optical sorting is used as well. So a sorted tea has been cleaned as well as sized, and part of what distinguishes a well-presented lot from a rough one is the thoroughness of that step rather than the size fraction it ended up in.
What size actually changes
Extraction rate, and through it everything else. Smaller pieces present far more surface to the water and have far shorter internal paths for dissolved material to diffuse along, so they release their solubles much faster. A fannings grade reaches full strength in well under a minute where a whole leaf takes several, and the compounds that arrive with time — the larger polyphenols associated with astringency — arrive proportionally sooner in a small particle. That is why the same steeping instruction produces a pleasant cup from one grade and a harsh one from another, and why the fix for an over-brisk cup of a broken tea is a shorter steep rather than a different tea. Size is a brewing variable of the first order, and treating it as a quality signal loses the practical information it actually carries. There is a second consequence for equipment. Small particles need a filter fine enough to hold them, so a broken tea in a coarse basket infuser produces cloudy liquor with sediment, while whole leaf in a fine paper filter is held so tightly that it never fully opens. Matching the filter to the fraction is a small decision that changes the cup noticeably, and it is why the same infuser rarely suits every tea in a household’s cupboard.
Why fannings and dust exist on purpose
Because a tea bag is a small permeable container that must produce a full-strength cup in a couple of minutes with no agitation beyond a dunk, and only small particles do that. The format demands the grade. Fannings and dust also brew more consistently than whole leaf, which matters enormously to a packer selling millions of identical units: consistency of extraction is a manufacturing requirement rather than a compromise. A third reason is economic, since small grades allow a robust, colour-forward, milk-tolerant cup from relatively inexpensive leaf. None of these is a deception. The bagged tea industry is a different industry making a different product for a different job, and the small grades are the correct engineering for that job rather than the leftovers of another one. There is a further practical reason that shows up in every catering context. A small grade extracts fully in the time a customer is willing to wait, from a bag dunked in a cup of water that is no longer boiling, with no control over dose or timing. Under those constraints whole leaf simply fails to produce a drink. Much of what looks like a quality compromise in mass-market tea is an accommodation to conditions that were never going to permit anything else.
Where whole leaf genuinely wins
Not automatically, and for specific reasons. A whole leaf can be inspected, so the buyer can see the plucking standard, the presence of stems, the uniformity of the lot and the condition of the leaf, and can read the wet leaf afterwards — all of which is impossible with a ground fraction and is a real loss of information. A whole leaf extracts slowly enough to be steeped repeatedly, which is the whole basis of the multi-infusion styles and where a good leaf earns its price back. And whole leaf preserves aromatics better in storage, because most of its mass is interior. Those three advantages are worth a great deal for teas whose value is in aroma, complexity and development across infusions. They are worth almost nothing for a strong breakfast tea drunk with milk, which is exactly the market the small grades serve. A fourth advantage is control. A whole-leaf tea can be brewed weak or strong, briefly or at length, once or six times, and it responds usefully to each; a fannings grade has essentially one setting and reaches it quickly. For a drinker who wants to adjust a tea to their own preference rather than accept the packer’s, that latitude is the practical difference between the two formats, and it is worth more than any claim about which is finer material.
How to read the fraction on a packet
As an instruction about brewing, not a verdict. If the leaf is small, dose accordingly and steep briefly, and expect strength and colour early. If the leaf is large, expect a slower start, give it room to open, and consider a second infusion. If a packet does not state a grade, the leaf itself answers: tip the packet out and look. Uniformity is worth as much attention as size, because a lot containing both large pieces and dust will extract unevenly no matter what it is called — the small material floods the cup while the large material is still opening. That unevenness is the genuine quality signal hiding inside the particle-size question, and it is visible on any kitchen table without any vocabulary at all. Dry leaf volume is a related trap worth knowing. Small dense particles pack far more tightly than fluffy whole leaf, so a spoonful of fannings can weigh several times a spoonful of a twisted white tea. Anyone dosing by spoon is therefore silently varying their ratio by category, which is the single most common cause of a cup that is unaccountably strong or weak. It is also the reason this catalogue records doses by mass and volume rather than in spoons.
The confusion with CTC, and with cut herbal material
Two adjacent things get folded into this vocabulary and should not be. CTC tea is not fannings: it is a different manufacturing process producing small dense granules by design rather than small fragments by sorting, and it has its own page. Cut-and-sifted herbal material — chamomile, peppermint, rooibos — is sized by the same logic for the same bagged-tea reasons, but it is not tea and its grades are named differently. The common thread across all three is genuine and worth keeping: particle size sets extraction speed, extraction speed sets brewing method, and any product engineered for a bag has been made small deliberately. The differences are worth keeping too, because calling a CTC granule a fanning misdescribes an entire industry. Matcha is worth adding to the list as the extreme case, because it makes the underlying principle unmistakable. Ground to a few micrometres and suspended rather than infused, it is not extracted at all in the sense the other formats are — the whole leaf is consumed. That is why it needs a bowl and a whisk rather than a filter, why it is the most fragile thing in the cupboard, and why particle size is the variable that determines the entire preparation rather than merely adjusting it.