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Just guessing, but perhaps your TV wasn't working quite right. A color TV with misadjusted convergence can show color fringing -- red, green, blue, or some combination -- during a B/W broadcast. This can be extreme or very slight.
Other causes might be misadjustment of the TV's "color killer" circuit, which turns off color for B/W material, or gray scale tracking, which balances the three R-G-B colors to produce a perfect gray (or white or black) when that's called for.
When I read old TV books, it's clear their goal was that black and white programs would look black and white on a color TV, not "enhanced" with any other color. This must have been especially important in early days, when most shows were still in B/W.
Or, I could be all wet. I don't know why broadcasting a B/W program as color would make it look colored. If you look at a portion of a color picture with a large B/W area, that looks black and white to my eyes.
Phil
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