變色的過程
這一支直接就是核心畫面：顏色正在被帶走，重點在事情本身，還沒講到留下什麼。
noun · C1
The process of something losing the colour it should have and turning a duller, darker or simply wrong shade — teeth going yellow, paper going brown, silver going black.
變色（過程）
核心畫面
One way to hold discoloration: colour quietly leaving. Nobody spilled anything and nobody did it on purpose — sunlight, damp, smoke or years simply pull the proper colour out of a surface and leave a wrong one behind. The word can point at the leaving, or at the patch it left. Which one you mean shows up in the grammar: no a for the change, a for the mark.
可以想成顏色悄悄離開的樣子。沒有人潑到什麼，也沒有人故意弄——只是陽光、潮氣、油煙或時間，把表面原本的顏色一點一點抽…更多收起
可以想成顏色悄悄離開的樣子。沒有人潑到什麼，也沒有人故意弄——只是陽光、潮氣、油煙或時間，把表面原本的顏色一點一點抽走，留下不該有的色調。這個字可以指「離開這件事」，也可以指「留下的那一塊」。要指哪一個，看文法就知道：講過程不加 a，講痕跡要加 a。From the word’s history
Wiktionary records discoloration as discolor + -ation. The parts are visible: dis- reverses, color is the colour, -ation turns the action into a thing you can name.
字源資料把 discoloration 記成 discolor 加 -ation。三塊都看得見：dis- 表示去掉或相反，color 是顏色，-ation 把動作變成一個可以稱呼的名詞。所以字面就是「把顏色去掉這件事」，正好對上兩個意思共用的畫面。
Wiktionary/kaikki extract supplied in this evidence packet (source_ref kaikki:3f6f69a190036ae4:637061833): 'From discolor + -ation.'
Two branches
變色的痕跡
同一個畫面往後看一步：顏色走完了，地上留著證據。名詞從「事情」滑到「結果」，這在 -ation 結尾的字裡很常見。
noun · C1
A mark or patch on a surface where the colour has changed, so that it no longer matches the area around it.
變色的斑塊