White bread that isn't white?

longtimesloper

Subject: White bread that isn't white?

OK, I know this isn't a PS topic, but this is where I hang out.

So, why is the white bread at the supermarkets (Wonder, Arnold, Pepperidge Farm, etc) actually white in color, but, the white bread at Trader Joe's (Canadian White Bread) not white at all and actually a taupe color (and, no, it is not wheat bread). I have seen other natural brand white breads also like this. What do they do to the more commercial white breads to make them actually white?