> ## Content Index > Fetch the complete content index at: https://www.storiesbehindgoods.com/llms.txt > Use this file to discover other available public pages before exploring further. # Black tea contrast training + Teativity offer - URL: https://www.storiesbehindgoods.com/black-tea-contrast-training-teativity-offer/ - Published: 2026-10-19T03:58:53.000Z - Updated: 2026-10-19T03:58:54.000Z - Author: MingHongKong This week’s focus is a simple training contrast: **leaf size**. You can see the idea here: → Big leaves (Assamica type) vs small leaves (Sinensis type) Teativity uses Yunnan big-leaf material at different altitudes so you can practise comparison inside one family — not random samples from everywhere. **Why this matters next to green vs black** Green tea is unoxidised. Heat is easy to get wrong: too hot pulls bitterness fast and can cover sweetness. Black tea is oxidised. Think of a cut apple turning brown — the leaf chemistry has already changed. That is why black tea is usually brewed hotter: you are not protecting the same fragile green profile; higher heat helps open aroma that oxidation has already shaped. Altitude still matters: higher gardens often keep more L-theanine character and a different catechin balance, which you can notice when leaf type is held steady. Another short reference on leaf and cup behaviour: **This week’s offer (until 26 Oct)** When you [order Teativity](https://take.app/storiesbehindthegoods?ref=storiesbehindgoods.com) by **26 October, you also receive** **one extra small-leaf organic black tea** at no charge, so you can run big-leaf vs small-leaf side by side. Teativity: **HKD 219 (\~USD 28) + shipping** US stock available for faster North America delivery while it lasts. If you want a simple staff exercise using only leaf size as the variable, just reply. Warmly, Ming Stories Behind the Goods *If you have specific questions, simply reply directly to this email. I read and respond to every message.*