"...Zonie, OK, do you believe most of the guns of the CW period were in the white?..."
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No. But this is what Flayderman's Guide says about a few of them:
1855 U.S. Percussion Rifle-Musket: "...all metal parts finished bright..."
1855 U.S. Percussion Rifle: "...all metal parts finished bright (except) blued barrel bands observed..."
1861 U.S. Percussion Rifle-Musket: "...All metal parts finished bright (rear sight sometimes blued)..."
1863 Rifle Musket, Type I (and II): "...All metal parts finished bright excepting casehardened lock; rear sights sometimes blued, as are occasionally barrel bands and some other parts..."
The 1863 Percussion Contract Rifle commonly known as the Remington Zouave had, according to Flayderman's Guide, a "...blued barrel, casehardened lock with all brass parts finished bright..."
Colts 1861 Special Musket was; "...Metal parts for most of the production were finished "in the white," but bluing was standard on nipples, rear sights, and various screws."
As was mentioned, the British the Enfields which were used by both sides in that War had blued barrels and bands with casehardened locks.