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The problem is not colored snow, but the unnecessary cross color (flickering colors) that occur on high-contrast fine black and white details (worse in non-comb-filter sets).
By the way, in the early color days, some stations put a color burst inside the left edge of the picture on B&W programs, and another burst just inside the right edge (the normal burst was not present, so the color was killed). By turning the horizontal hold on a color set, you could pull the H phasing over to where the left side burst went through the burst gate, opening up the color killer. Then if all was well, the right-side burst would appear as a vertical yellow-green stripe in the picture. On any reasonably wideband B&W set, you could see the subcarrier dot pattern in these stripes.
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