Colours in mink stole (4)

I believe the answer is:

inks

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'colours' is the definition.
The definition and answer can be both related to change as well as being verbs in their -s form.
Maybe there's an association between them I don't understand?

'in mink stole' is the wordplay.
'in' says the answer is hidden in the clue.
'INKS' is hidden in the letters of 'mink stole'.

Can you help me to learn more?

(Other definitions for inks that I've seen before include "Printing fluids" , "Liquids used for printing" , "Printers' mediums" , "Fluids from cuttlefish" , "Sink beneath writing fluids" .)

I've seen this clue in the Sydney Morning Herald.

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