Gold Label Show White Powder for Horses is a non-toxic, brilliant whitener , which can be applied to the socks, blazes and other white markings of horses prior to being shown.It is particularly effective for use on the feathers of shires and heavy horses.This super whitener is much more effective than more traditional chalk blocks and is even resistant to rain, yet it can be easily removed with warm water.Gold Label Show White Powder is completely safe to use and non-allergic.