A colourant is a substance you add to change the colour of something — most often someone’s hair. Hairdressers put a colourant on hair to make it darker, lighter, or a new shade.

A colourant is a substance you add to change the colour of something這個字指的是你加進去用來改變某樣東西顏色的物質 —— most often someone's hair最常見的是頭髮 —— Hairdressers put a colourant on hair髮型師會在頭髮上上 colourant to make it darker讓顏色變深, lighter變淺, or a new shade或變成新的色調

The same kind of word can also name a dye in food, plastic, or cloth, though in daily British English food colouring is the more common phrase for what goes in cakes. This is the British spelling; American English usually writes colorant.

The same kind of word can also name a dye in food, plastic, or cloth同樣這種字也可以用來指食品、塑膠或布料裡的染劑, though in daily British English food colouring is the more common phrase for what goes in cakes不過日常英式英語裡，蛋糕裡加的東西更常說 food colouring —— This is the British spelling這是英式拼法; American English usually writes colorant美式英語通常拼作 colorant

Though actually, it is a slightly technical, product-label word. At home people more often say dye (for hair or cloth) or food colouring (for cooking).

Though actually不過其實, it is a slightly technical, product-label word這是個有點專業、產品標籤上會出現的字 —— At home people more often say dye在家裡大家比較常說 dye (for hair or cloth指頭髮或布料) or food colouring (for cooking)或說 food colouring（指烹飪用的）

You will meet colourant on bottles, in science class, and in industry.

You will meet colourant on bottles你會在瓶罐上看到 colourant 這個字, in science class在科學課上, and in industry還有在工業上