Has the influence on the intensity of the
colours Black, Chocolate and Cinnamon (and Red).
The ressecive part of this gene [dd]
dilute the normal dense colour and turns a Black colour into a Blue, a Chocolate
into a Lilac and a Cinnamon into a Fawn (and a Red into a Cream).
The dense colour dominates over the
dilute.
[DD] [Dd] [D-] is the dense colour.
[dd] is the dilute colour.