Why is there no such thing as a pure white horse?

[ColbyBacon]

god made it that way if your religious if not than it i cause of genetics and atoms and what not

 

[HunterJumper]

than whats this http://www.theage.com.au/ffximage/2008/03/26/wbRACINGfilly_wideweb__470x318,0.jpg

 

[Alessa]

A lot of people seem to say there's no such thing as a pure white horse, the closest thing is a grey horse that only appears to be white. Why is this not a possible colour of horse?

 

[GG]

then its thing wont be long at all

 

[NanogigLunga]

yes there are but they usually have a bit of black or brown