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茶筅使用三步驟：溫水潤筅軟化竹穗→手腕快速刷出 W 字→收尾提起。用後清水沖洗、置於茶筅立陰乾，可大幅延長壽命。本文含新手常見錯誤與保養 FAQ。
抹茶一份（2g）約含 40–70mg 咖啡因，低於一杯咖啡（約 95mg），但因富含茶胺酸，提神更平穩不心悸。本文完整比較抹茶、咖啡、綠茶、紅茶咖啡因含量，並解答每日安全攝取量、孕婦能否飲用等常見問題。
How should matcha powder be stored after purchase? Should it be refrigerated or frozen before opening? What should you pay attention to after opening? This complete guide tells you the four factors that affect matcha quality, the correct storage steps, and the five most common mistakes, ensuring your matcha powder stays in optimal condition from the first day to the last.
