Since SFH's all look different it is difficult to tell, but definitely a possibility. They can even be white or brown. Yellow and black or blue are normal colors though.
SFH, Isabelle leghorns and lovely Silverudd Blue (formerly called Blue Isbar)
-Silver Ameraucana, Queen Silvia and East Frisian Gull. Eggs fall 2016.
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VA Poultry Approval #213