Relating to or serving the purpose of coloring or adding color to something.
From coloration + -ive (adjective suffix meaning 'tending to' or 'relating to'). The -ive suffix appears in words like 'creative' and 'active,' indicating a quality or function.
Colourative is a technical term mostly found in chemistry and biology texts when discussing substances that function primarily to add color—it's the scientific way to say 'color-giving.'
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