Well this might sound weird but yeah that's exactly what I want to know!
Now as per US-English colors is the right word and as per British-English colours is the right word. Here in India we follow British English and also the local trend on Google Trends suggests that colours is more searched for in the market that my site is gonna target.
Also when I went through my competitors site they are mixing both keywords colors and colours.
As we all know Google returns separate results for colors and colours.
So I am kinda confused. Should I go for mixing of both the keywords which I feel is wrong or should stick with one keyword?