Types of Grey…

STEEL GREY

A steel or iron grey has mainly black hair, spread evenly in their coat.  They have a uniform / smooth blend, giving the colour of fairly dark, polished metal, some have a metallic sheen.  This is most common when they are youngsters.  The mane and tail are a similar mixture.  The legs and points are usually black or dark.  Very dark iron greys can still appear black or black / blue in certain light.  White leg and face markings are common.

DAPPLE GREY

Dapple grey horses look like rocking horses with predominantly paler bodies and black rings, circles or dapples of hair.

The dapples tend to be mainly across the shoulders, base of neck, tops of the hind legs and quarters, but can be anywhere.  The base coat can start dark, closer to steel grey, and fade to almost silver. 

The knees, hocks and other points are often black and the mane and tail can be any tone, dark to light depending on the ratio of black hair to white.  These rings will change with the seasons, getting less and paler through time, and give the mottled look.

Dapples are sometimes caller eraser marks.

FLEA BITTEN GREY

Flea-bitten greys have a light coat as the base, with small brown and / or black flecks, rather like freckles, spread anywhere throughout his coat.  A horse can be heavily or lightly flecked and the flecks themselves can be smaller or larger.  If a horse has a flea-bitten coat, he will usually keep this for the rest of his life.  This is not roan or appaloosa. 

LIGHT GREY

A light grey horse has mainly white hair.  The skin is black, especially seen at the muzzle, inside the ears and between the hind legs.  The mane and tail can be white or silver and the other points are usually the same colour as the coat.  The last places to turn white in an aging horse are often their knees and hocks.  These horses must have whorls and hoof colour noted for their ID.  Most often called white.