Gravan SilverPark SoulSista (Sista) Most people dont know what to think of her color. Sista is a double mottle. This would be similar to what happens if two palominos or two buckskin horses were bred together. The color is diluted. In this instance the backgound color in the mottle is essentially washed out. It is simply a color fault and easily corrected when bred back to a 'normal' blue or red.