When macha is sticking to everything in the cup, it's a good indication that it's going to be bitter.
Stodgy macha will always be bitter.
When macha is sticking to everything in the cup 抹茶がコップの中の周りにべたつくと, it's a good indication that it's going to be bitter. その抹茶は苦い味でしょう
Stodgy macha べたつく抹茶will always be bitter. いつも苦い味です
If the fine powder clings to the tea leaves, it can cause a bitter taste.
If the fine powder clings to the tea leaves, it can cause a bitter taste.
『細かい粉が茶葉にまとわりつくと、苦味の原因になることがあります』
・fine powder「細かい粉、微粉」
ただの powder(粉)よりも、「非常に細かい粉」を強調したいときによく使われる表現です。