Like Cindy , I also use just plain Food Coloring , McCormick's brand that come in the little drop shaped bottles . It dries fast and can be recoated as many times as you want to make the colors more vivid . They also make it in bigger bottles and lots of colors including pink and orange , those colors are used to color Icing for cakes . Larger Supermarkets will have most of them .
To keep the colors bright and lasting you should use a good finish , CA , Lacquer or poly work fine , friction polishes will wear quickly and allow moisture to enter and fade the colors very quickly .
As for kit platings , for the orange I would use gold and for the pink Chrome or silver , or Black Ti will work with both colors.