This effect is accentuated in white feathered birds. The cockrel has very small wattles indicating that it is carrying the pea comb gene linked to the blue egg gene. A cross between a blue egg laying naked neck Silkie hen and a normal Silkie rooster also produces fully feathered Silkie hens laying blue eggs. The fully feathered Silkie hen, whose picture appears below, has all the characteristics required by the British and American standards but it lays a blue egg. The eggs laid by Silkies carrying the blue egg gene come in a range of shades- from a very light blue to a deep olive green.
Black silkie hens tends to lay dark olive green eggs.
Silkie eggs generally have a shiny appearance due to the waxy cuticle on the outside of the shell. This cuticle is also present in the blue eggs. My breeding program has shown that the standard Silkie shown in Australia does not have a true walnut comb as required by the British and American standards but in fact has a rose comb. The blue egg laying Silkies have a true walnut comb as they carry pea comb gene linked to the blue egg gene. The eggs below have all been laid by blue egg laying Chinese Silkies.