nail polish 
noun [mass noun]
Varnish applied to the fingernails or toenails to colour them or make them shiny.When they threw off their veils, we saw the kohl, lipstick, rouge and nail polish that the women wore....
- I was good at making little shapes on my finger nails when chipping nail polish.
- Next came the first coloured nail polish - in a rose shade - with deeper hues to follow by 1930.