Oxidation & Roast

A Rainy Pick Day Caps a Rock Tea's Aroma, and No Roast Recovers It

A 2025 GC-MS study found rainy-day-picked Wuyi rock tea carries 40 to 74 percent less floral and fruity aroma compound than sunny-day leaf, and processing cannot fully make up the deficit.

A charcoal roast is a sequence of fires, rested months apart

Charcoal roasting is a sequence of separate fires, not one step, and each fire does distinct, measurable chemistry to the leaf. The practice also varies more across oolong styles than most tea copy admits.