紫 is one of the most commonly used Japanese kanji, and it also has a lot of special readings in addition to the standard onyomi and kunyomi readings.
ONYOMI 音読み
むらさき murasaki
KUNYOMI 訓読み
シ shi
Examples
その色はピンクというより紫だ。The color is purple rather than pink.赤と青を混ぜると紫になる。Red and blue paint mixed together give us purple.紫のじゅうたんはこの赤いカーテンと調和しないだろう。A purple carpet will not go with this red curtain.