What does 光沢 mean?
光沢 is a Japanese noun meaning “luster, glossy finish (of photographs)” in English. It is written as 光沢 in kanji, こうたく in hiragana, and koutaku in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
この指輪は光沢をうしなった。
This ring lost its luster.