In the process of removing color; tending to remove or reduce color (American English).
From decolorize + -ing (present participle and gerund suffix). The -ing form creates both the ongoing action and an adjective describing something with that property.
The '-ing' ending in English is incredibly flexible—'decolorizing' can be a verb form ('we are decolorizing'), a noun ('decolorizing takes time'), or an adjective ('a decolorizing agent')—this flexibility lets English say more with fewer words!
Complete word intelligence in one call. Free tier — 50 lookups/day.