Testors paint [MENTION=563697]djfetti[/MENTION] . Try mixing two colors until you get close. Then if needed ad a touch of a third if that is what it takes. I use popsicle sticks to dip into the paint jar and mix the paint in a water or soda bottle cap since I use small quantities. Those small coffee stirrers could work if you have them.

It is best to do your mixing and painting outside even if it is cloudy to get a better color match. I usually paint inside at night since I often don't have the time to do hobbies in the daytime.