High-quality matcha has a vibrant deep green color, which indicates that the tea leaves were grown in the shade. Those with a yellowish tint or dullness tend to have lower freshness and quality. The depth of green reflects the balance of chlorophyll and amino acids (umami). The ideal aroma is a refined and rich fragrance called "ooi-ka" (covered aroma), while grassy or off-putting aromas are signs of low quality.[^4]

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