Blemish; dye (5)
I believe the answer is:
stain
I believe this is a double definition.
'blemish' is the first definition.
(stain is a kind of blemish)
'dye' is the second definition.
(staining is a kind of dyeing)
(Other definitions for stain that I've seen before include "Spot - shame" , "Colour, dye" , "Taint" , "Dirty mark; dye" , "Stigma" .)