Orthodox processing

What it is

Orthodox manufacture is defined by what it does not do to the leaf. Withered leaf is passed through a rolling table that twists and presses it, rupturing cells enough for oxidation to proceed while leaving the leaf structurally whole. Extraction is therefore gradual and incomplete in any one steep, which is exactly what allows a garden, a flush and a leaf grade to be tasted at all. It is slower, lower-yielding and more skill-dependent than the alternative, and it is the only route that produces tea worth selling as a single origin.

What it does to the leaf

Twists and presses the leaf to rupture cells without severing it, preserving leaf integrity through oxidation and drying.

What it does to the cup

Slower, more layered extraction with more aromatic complexity and less immediate strength than cut leaf.

Variants that matter

Ways this step is carried out that produce genuinely different results, rather than regional names for the same thing.

Rotorvane pre-treatment

A partial maceration step sometimes used before orthodox rolling to raise yield, sitting between the two routes.

Hand rolling

Still used for high-grade Chinese and Nepali production; slower again, and the source of the tightest twists.

Other steps at the Rolling and shaping stage

• Blending to a standard — Combining lots so that a named tea tastes the same in March and in October, which is a manufacturing step performed on finished tea and not a compromise applied to it afterwards.
• Cloth-ball rolling — Wrapping leaf tightly in cloth and repeatedly kneading and unwrapping it until it forms tight spheres.
• CTC (crush, tear, curl) — Leaf passed through counter-rotating toothed rollers that cut it into small uniform granules.
• Curling and down-raising (cuo tuan xian hao) — Rubbing warm leaf between the palms into loose balls and breaking them apart repeatedly, which curls the leaf into spirals and lifts its down to the surface.
• De-stemming and de-veining — Separating stem and leaf vein from the leaf blade after drying, usually by air separation.
• Flat shaping — Pressing leaf flat against the side of a heated wok by hand during pan-firing.
• Needle shaping (li tiao) — Shaking fixed leaf along heated parallel grooves until each piece straightens into a needle, rather than twisting it into a curl.
• Pearl forming (chao gan cheng yuan) — Working rolled leaf against the wall of a heated pan through successive pans until each piece closes into a hard sphere, drying and shaping in the same operation.
• Refining (shiage) — The second factory. Japanese green tea leaves the producer as aracha, an unfinished trade good, and is cut, sorted and separated elsewhere into the several named teas one intake contains.
• Repeat rolling and roll-breaking (fu rou) — Rolling is done in two or three passes with the compacted lumps broken up and sifted between them, because one long pass tightens the outside of a ball of leaf and never reaches the middle.
• Rolling and shaping — Working the leaf to rupture its cells and give it a form that governs how it later brews.
• Rotorvane maceration — A screw press with internal vanes that macerates withered leaf continuously, sitting between orthodox rolling and CTC rather than belonging to either.
• Sorting and grading — Separating dried tea by particle size, density and colour into the grades it is sold as — a sorting operation, not a quality judgement.
• Stalk picking (jian ti) — Hand removal of stalk and yellow leaf from finished oolong, done between roasts rather than at the end — which is why it is an ordering fact and not a tidying-up one.
• Stone milling — Grinding de-stemmed tencha into powder between slow-turning granite wheels.
• Strip rolling — Rolling leaf into long twisted strips rather than compressing it into balls.

Teas that go through this step

• Anamalai tea
• Bitaco tea
• Charleston black tea
• Indonesian orthodox black
• Kenyan orthodox black tea
• Lankaran tea
• Magwa tea
• Orthodox black tea
• Rwandan orthodox black
• Sahambavy tea
• Vale do Ribeira tea

Guides covering this step

• How one machine changed the world tea trade — Crush, tear and curl was a manufacturing change that turned into an economic one. It made tea cheap, strong, fast-brewing and suitable for a bag, and in doing so it decided what most of the world means by the word tea.
• OP, BOP, FTGFOP: what the letters mean, and what they cannot tell you — The letter grades describe the appearance of sorted leaf in one family of producing countries. They are a real, useful and precisely defined vocabulary about size and tip content — and they are not a quality scale, not comparable between origins, and not awarded by anybody.
• Orthodox and CTC are two industries, not two qualities — One process was designed to preserve the leaf and the differences between lots; the other was designed to produce a uniform, strong, fast-brewing product at scale. Comparing them on a single quality axis misses that they were built to different specifications.
• Commodity tea and speciality tea are two different industries — They share a plant and almost nothing else. Different unit sizes, different definitions of quality, different buyers, different risks and different reasons for existing — which is why advice drawn from one is so often wrong about the other.