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A free to use illustrated guide to horse coats.
Page Eight - Modifiers

Silver...........................................................................................................................................
-Modifier
Notable Gene: Extension [E] Silver [Z]
Variations: N/A
Description: Light mane on a dark base.
Geno: E_ aa Z_ // E_ A_ Z_

Flaxen
-Modifier
Notable Gene: Flaxen [f]
Variations: N/A
Description: Light mane on a chestnut base.
Geno: ee __ ff
Expresses only as double lowercase [ff], and never with extension [E].

Sooty
-Modifier
Notable Gene: Sooty [Aty]
Variations: N/A
Description: Mixed black hairs, typically back-line down.
Geno: __ Sty_

Pangare
-Modifier
Notable Gene: none
Variations: N/A
Description: Mealy-looking pale hairs up underside of red-
based coats (chestnut/bay, not black).
Geno: +pangare
(there is no geno marker! 'PNG' has not been founded!)

Birdcatcher Spots
-Marking
Notable Gene: none
Variations: N/A
Description: Sparse white spots on body.
Geno: +birdcatcher spots
(there is no geno marker! 'BC' has not been founded!)

Grease Spots
-Marking
Notable Gene: none
Variations: N/A
Description: Sparse 'grease smears' on body.
Geno: +grease spots
(there is no geno marker! 'GS' has not been founded!)

Brindle
-Mutation
Notable Gene: none
Variations: N/A
Description: Scattered, dark, vertical lines along body.
Typically form of chimerism from fused fraternal twins.
Geno: +brindle
(there is no geno marker! this is a mutation!)

Reverse Brindle
-Mutation
Notable Gene: none
Variations: N/A
Description: Scattered, light/white, vertical lines along body.
Typically form of chimerism from fused fraternal twins.
Geno: +reverse brindle
(there is no geno marker! this is a mutation!)

Lacing
-Marking
Notable Gene: none
Variations: Typically appears and extends with age.
Description: White 'giraffe-like' pattern.
Geno: +lacing
(there is no geno marker! not enough research)
(thought to be a fungal infection, not a gene)

Gulastra Plume
-Marking
Notable Gene: Sabino [Sb1]
Typically associated with sabino.
Variations: N/A
Description: White tail.
Geno: +gulastra plume
(__ Sb1_ [+gulastra plume])