CTC (Crush-Tear-Curl) black tea processing

CTC (Crush-Tear-Curl) processing is the dominant black tea production method globally by volume and the foundation of the world's commercial tea bag market. Sir William McKercher invented the CTC machine in Assam in the 1930s as a way to industrialize black tea production: instead of the labor-intensive multi-step orthodox process, leaves pass between rotating toothed rollers that simultaneously crush, tear, and curl them into uniform small pellets. The extensive cell disruption produced by CTC processing accelerates oxidation dramatically (full oxidation in 60–90 minutes vs 2–4+ hours for orthodox), and the uniform pellet form is ideal for fast-infusing tea bag preparation.

CTC dominates the global commercial tea industry: most Assam production is now CTC, most Kenyan tea is CTC, and large portions of Sri Lankan and Indian Nilgiris production are CTC. The cup character emphasizes briskness, body, and rapid infusion at the expense of the aromatic complexity that orthodox processing preserves — appropriate for English Breakfast blends, Irish Breakfast, masala chai, and the bagged tea that dominates supermarket shelves worldwide. Specialty tea explicitly defines itself against the CTC commodity tradition; almost no specialty tea brands carry CTC-processed tea. But the technique remains the practical foundation of how most of the world drinks black tea.

Key processing steps

1. Mechanical harvest
2. Withering
3. CTC machine processing: leaves passed between toothed rollers that crush, tear, and curl them into uniform small pellets
4. Rapid oxidation (much faster than orthodox due to extensive cell disruption)
5. Drying
6. Grading into commercial tea bag grades (BP, OP, etc.)

Tea categories produced

Cup signature

Brisk, bold, strong. Designed for fast-infusing tea bags and milk-tea preparations.

Typical origins