Whenever I use nail polish on my toes, even though I don’t keep it on for long, it stains my toe nails yellow. It’s very unattractive. There is nothing wrong with my nails. I have tried using several layers of base coat underneath the nail polish but it doesn’t seem to help. Recently as an experiment, I allowed the stained nail to grow out until there was fresh, clear nail remaining. Believe it or not it took a few months. Then I used only clear nail polish on my toes for about one week. When I removed it I found that the clear top coat had stained my nails too! Is there some special brand that won’t cause this? And why is it happening?