Nila-Lohitam

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“Lord Nrsimha is the sacred absolute truth. He is the Supreme Brahman. He has a lion-human form with a dark-reddish-brown countenance. He is a perfect brahmacari in His behavior. His eyes are terrifying to look at, yet He bestows auspiciousness on all. His throat is bluish and His face is like a burning red iron. Therefore He is known as Nila-Lohitam [ bluish with a glowing reddish effulgence ].

[ Nrsimha-tapani-upanisat, Purva, Upanisat 1. End of fifth paragraph ]