Why "Brown" Means "Tea Color" in Japan

In Japan, the word for the color brown is 'Chairo,' which literally translates to 'the color of tea.' While modern Japanese green tea is vibrant green, back in the day, tea was prepared by boiling dried leaves, resulting in a reddish-brown liquid. That's why the color of tea became the name for brown.
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Interestingly, high-quality Matcha has been green since ancient times, but it was an
exclusive luxury for the elite. The common people drank 'Senji-cha' (boiled tea), which was brown. Since this was the tea most people saw every day, the word 'Tea-color' (Chairo) stuck as the standard term for brown, even after green-colored Sencha became popular later in history.