Flaxen
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Appearance
Flaxen will lighten the mane and tail, anywhere from just slightly lighter than the body coat to a creamy white.
The hair can either be a solid colour, or have a gradient "ombre" effect where the roots have a color similar to the body coat and the tips are much lighter.

Flaxen chestnut with solid mane/tail
chestnut + flaxen

Flaxen liver chestnut with solid mane/tail
chestnut + flaxen

Blue flaxen chestnut with gradiented mane/tail
chestnut + blue + flaxen
Optional effect: Mealy
Flaxen can cause a mealy soft gradient effect on the lower legs and/or around the muzzle, in a similar color as the mane and tail.
Mealy should not go above the knees on the legs.
Mealy is not written in the phenotype, a flaxen horse with mealy effect would still only be described as for example "flaxen chestnut".

Flaxen chestnut with mealy effect
chestnut + flaxen

Flaxen honey with mealy effect
chestnut + tawny + flaxen
Optional effect: Speckles
Flaxen can have light speckles along the body coat, scattered randomly or arranged in simple patterns. They can be gathered in small clumps similar to flowers, but each individual speckle should still be a somewhat natural-looking spot or smudge.
Speckles will always be the same color as the mane/tail, or a mix between the mane/tail and the body coat. Multiple colours within the speckles are possible, either as gradient or individually coloured speckles.
Speckles is not written in the phenotype, a flaxen horse with speckles would still only be described as for example "flaxen chestnut".

Flaxen chestnut with mealy and speckles
chestnut + flaxen

Flaxen liver chestnut with speckles
chestnut + flaxen

Flaxen palomino with speckles
chestnut + cream + flaxen