One picture holds this word together: colour going onto something. Think of a hand with a crayon, filling colour into the shapes of a drawing. From that one picture the word reaches in two directions. Looking back at the hand, you get the activity itself, the stuff in the bottle that the colour comes from, and the word you put in front of a noun to say 'this is the thing that gives the colour'. Looking forward at the finished picture, you get the colour that is simply there on a face, a bird or a leaf, as if nature had done the colouring already.
From the picture
生下來就帶著的顏色
這一邊可以想成把鏡頭移到上色完成之後。沒有人拿筆，顏色卻已經在那裡了。英文用同一個字來說這件事，好像是自然先幫這個人、這隻鳥把色上好了。所以這裡的 colouring 不是材料，也不是動作，而是你看到的那整組顏色。
noun · B2
The natural colour of a person's skin, hair and eyes, thought of together as one overall look rather than as three separate things.
（人的）膚色髮色
noun · A2
The activity of putting colour into pictures. It covers filling in the shapes of a drawing that is already printed, and also drawing your own picture with crayons or coloured pencils.
著色；塗顏色
noun · B1
A substance that is added to food or drink to give it a particular colour. It may come from a plant or be made in a factory, and it usually changes only how the food looks, not how it tastes.
食用色素
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
colouringadj
Of something that provides colour.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。