Here at hellomagazine.com's Beauty channel, we love dramatic nail colours and wear dark or bright polish all the time. Yet we never have yellowing nails – usually caused by pigments in the polishes staining the natural nail plate. And that's because we never ever forget to use a base coat first. If you need to do your nails for a night out, but don't have any base coat to hand, apply clear polish instead. It may not help the coloured polish 'stick' as well as a proper base coat, but will at least form a barrier against staining.