Question: text in color in places in printf

I have say  I am taking for example purpose only i need in general

v:="1:1":
k:=4

printf("%s]  is %g, v, k) 

Now i want the %s] part in some other color say green or red some dark color.

the %s is inside which need to replaced by the v which will keep coming

I want it for a general say for some part of the printf in some color

At present atleast i want

let F be a function say F(v,k) and it prints out 

printf("%s]  is %g, v, k)  where it prints out the %s] part in dark color

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