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A free to use illustrated guide to horse coats.
Page Six - Grey + Markings

Dapple Grey....................................................................................................................
-Gene
Notable Gene: (Extension [E])
Variations: N/A
Description: Grey on Dark Base (usually Black).
Geno: (E_) __ Gg

Steel Grey
-Gene
Notable Gene: Extension [E]
Variations: N/A
Description: Grey on Black.
Geno: E_ aa G_

Mulberry Grey
-Gene
Notable Gene: Agouti [A][A+]
Variations: N/A
Description: Grey on Bay or Wild Bay.
Geno: E_ A_ G_ // E_ A+_ G_

Seal Grey
-Gene
Notable Gene: Agouti [At]
Variations: N/A
Description: Grey on Seal Brown.
Geno: E_ At_ G_

Rose Grey
-Gene
Notable Gene: N/A
Variations: N/A
Description: Grey on Chestnut.
Geno: ee __ G_ // ee aa G_

Rabicano
-Marking
Notable Gene: Rabicano [Rb]
Variations: Minimal/Frosted, Standard, Extensive
Description: Limited roaning in specific pattern/area.
Geno: __ RbRb // __ Rbrb

Sabino
-Marking
Notable Gene: Sabino [Sb1]
Variations: Minimal, Standard, Extensive, Maximum
Description: White spotting patterns, usually from belly upwards.
(Maximum may be mistaken for Dom White).
Geno: __ Sb1Sb1 // __ SbSb // __ nSb1
Part of KIT gene. RnSb | SbTo | WSb

Roan
-Marking
Notable Gene: Roan [Rn]
Variations: N/A
Description: Mix of white and pigmented hairs, dark points.
Geno: __ RnRn // __ nRn
Part of KIT gene. RnTo | RnSb| WRn

Dominant White
-Marking
Notable Gene: Dom White [W]
Variations: N/A
Description: Covers entire body in white.
Geno: __ RnRn // __ nRn
Part of KIT gene. WTo | WSb| WRn

KIT Gene
Tobiano, Sabino, Roan, and Dom White are part of KIT gene.
All present in same slot. Thus, a horse cannot have more than two.