When a cake has out lived its freshness, it tends to get hard (which is slowed down by icing). Remember milk and eggs are some of the ingredients found in cake if you are unsure, it is best to just trash it. I wouldn't recommend keeping a unfrozen cake for more then a week; in the freezer, it can last much longer (months) if it has been properly wrapped.
It usually goes into a solid block if it i spoiled.
Sliminess, off-odor and unusual colors will tell you if mashed potatoes are spoiled.
They are spoiled when they are brown and slimy.
To tell if a like is spoiled it will have browny Blacky large spots on it and will be really soft and easy to squeeze
You can tell if a smoked turkey leg is spoiled in a few ways. The biggest way is that it smells bad.
If a pork loin is spoiled it will have a foul smell and color. Throw it away because it is unsafe to eat spoiled food.
Sight and Smell!
no pork does not smell spoiled when smoking it does not smell like anthing.
Cake would be said "Pastel" (pass-tell).
When the blueberry is soft and squishy it has gone past its prime.
It is cake that has spoiled and gone bad. This cna be for a number of reasons. Mold coould have begun to grow. Also, the fluffy-ness in cake decreases as soon as it is not baking any more. As the days pass, this will result in the hardening of the cake, making it sour and firm and not good to eat.
It depends on the cake and on the size of the cake. It is usually about one cup. But, just follow the recipe, it will tell you.