Sunfire is a Co-Dominate gene thats intensifies the saturation of color in Retics, both by brightening base colors like oranges, and also by darkening and cleaning up the black patterning while changing the pattern slightly.  Breeding a Sunfire to anything will make a half clutch of Sunfires, and breeding two Sunfires together create the more intense SuperSun.  This color mutation has proven to be the key to improving on many pattern and even other color mutations, adding color and contrast to anything it is combined with.  Even the normal siblings from Sunfire breedings get a little extra dose of color.