Are green beans bad if they have a milky substance?

It sounds like you might be describing string beans, which are sometimes called snap beans or green beans.

Here's what you need to know about the milky substance:

* It's not necessarily bad. The milky substance is actually sap, which is completely natural and harmless. It's more common in string beans that are picked young and tender.

* It can be removed. If you find the milky substance off-putting, you can easily remove it by blanching the beans for a few minutes. Blanching also helps to improve the flavor and texture of the beans.

To know if the beans are bad:

* Look for signs of spoilage: Mold, discoloration, wilting, soft spots, or a slimy texture are signs that the beans have gone bad and should be discarded.

* Smell the beans: Bad beans will have an unpleasant odor.

In conclusion: The milky substance in string beans is normal and harmless. However, if you notice any signs of spoilage, the beans are no longer safe to eat.