The process or action of removing color from something.
From decolor + -ing (present participle suffix). The base verb 'decolor' comes from de- + color, with -ing forming the gerund noun describing the ongoing process.
The '-ing' ending in English is magical—it can turn any verb into a noun representing the action itself, which is why we have hundreds of -ing words describing processes like 'decoloring' that describe what's actually happening in real time.
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