JOEL - Most times you read about God appearing to man in the Old Testamant it is actually the pre-mortal Jesus Christ, who is the God of this earth. I don't think Daniel's description has anything to do with the color of God's skin actually being like "polised brass". He was merely trying to identify the brilliance and unusual colors that he saw coming from God as a result of His majesty and glory.

Ezekial described Him as having "the appearance of fire" (Ezekiel 1:27)

John described His Hands and hair as being "white like wool" and His eyes like "flames of fire"(Rev. 1:14)

In our LDS scriptures, Joseph Smith said "His eyes were as a flame of fire; the hair of his head was white like the pure snow;" (D&C 110:2-3) and that His "brightness and glory defy all description"(J. Smith History 1:17)

None of these should be taken literally as what the exact coloring of God is. It is simply a mortal man's attempt at explaining something that he has never seen before and that he can not adequately explain in terms understood by any other mortal man.