The "pink slime" backlash is oozing into the nation's biggest conventional retailers. Yesterday, Kroger Co. and Stop & Shop said they would no longer carry any beef that includes the ammonia-treated, leftover beef trimmings. The companies join Safeway, Supervalu (Albertsons) and Food Lion, which all announced their intent earlier this week.

The Internet news source The Daily sparked this most recent "pink slime" outcry, when it reported that 7 million pounds of the "lean, finely textured beef" would be available in school cafeterias this spring. The beef is spun to remove most of the fat, then compressed and exposed to ammonium hydroxide gas to kill e. coli and salmonella. This mix is added to ground beef and hamburger patties.

But not all retailers carried the beef. Whole Foods Market, A&P and Costco say they never sold the product.

Last year, Jamie Oliver's Food Revolution devoted a segment to "pink slime" which prompted McDonald's, Burger King and Taco Bell to discontinue use of the meat. Now, the nation's largest grocers are following suit. Even Walmart, while it didn't say it would stop selling the beef, said it would offer other beef that does not contain the filler.