blue cochin changing colors?????

[davony's chicks]

I bought a young blue cochin that I thought was a hen in October.... This hen grew wattles and is now changing colors on the tips of it's feathers to kind of a caramelish color. This color change started around the neck and is now present in the tips of the wings.
Can anyone shed some light on this??
What is this strange cochin?
Help me please.....

 

[Sonoran Silkies]

photos?