Wet and juicy is OK, but you never want your meat to be slimy to the touch,” advised Peisker. The surface of the meat will have a sheen to it, and the slime may have a yellowish hue when it catches the light. If it feels slimy, it's starting to go bad. So the slime and mold appeared to go hand-in-hand, probably growing because the meat in the second case wasn't handled properly.   The slime on the surface is caused by the buildup of bacterial cells. So while that brine is generally harmless, I find slimy deli meat disgusting and throw it … Technically, the preparation of the deli meat usually involves brining it ( [WIKI] ), and that slime is brine being released back. Rather it’s caused by light diffraction. Once fish has fully spoiled, the slimy moisture on the meat … Uh...how has it been stored? Another noticeable sign of steak gone bad is when several color patches are created on the surface. After passing the look and touch tests, then it's time to use your nose. Any odd or off smells of vinegar, ammonia, or yeast mean it's time to throw out the turkey, pastrami, or ham. Feel for a slimy coating on the raw fish. If your steak is bad, it will often look and feel slimy and slippery to the touch. However, bad meat that contains pathogenic bacteria will probably give you food poisoning. If the wet surface becomes slimy, the deli meat is about to go off. It’s slimy. If you notice colors like brown, yellow or green instead of the red, pinkish meat color, then your steak is spoiled. If the meat is extremely slimy with a film on the outside, throw it away. As fish ages and begins to go bad, its outer surface will become wetter and eventually develop a thin layer of slime. "Strong off-odors, not slime, indicate spoilage," says Brian Nummer, Ph.D., a food-safety professor at Utah State University.   If it smells funky or off, it's spoiled. This slimy film is usually created just before the meat starts to mold and go bad. “If the meat is sticky or super slimy, throw it away. 2. All tainted meat, whether it's beef, pork, chicken or veal, gets a slimy residue on it when it has gone bad — even in highly processed proteins like bacon and deli meats. This is a good sign that your fish has begun to spoil. “You may notice on sliced roast beef an odd and metallic rainbow appearance; this isn’t a spoilage indicator. What you really want to watch out for even more so than color change, is meat or poultry that has a bad odor or is sticky, tacky, or slimy to the touch. If it passes the sniff test, you're good to gobble. In ground beef, the signs you'll detect will depend on how badly spoiled it is. Let your other senses be your guide in … “Different meat has different smells," said Peisker but, generally, rotten meat actually smells slightly sweet. After that experience I'm never eating slimy deli meat, because it definitely shows something is wrong – Nicholas Pipitone Apr 26 '19 at 21:25 However, bad meat that contains pathogenic bacteria will probably give you food poisoning. If you've cooked bad meat, it's not guaranteed to make you sick. Slime is pretty grim in any situation, but it’s a particularly bad sign if it’s on your steak. The smell is caused by the gases produced by the bacteria. Because my answer would depend a LOT on that. Rastelli admits that the slime “may appear odd to a consumer,” but he insists that it doesn’t mean your meat has started to go bad.