What is wrong with potato soup that has small bits of white stuff floating in it looks like soured milk but the was good?

There are a few possible reasons why there might be small bits of white stuff floating in your potato soup:

* Curdled milk: If you added dairy products to your potato soup, such as milk or cream, it is possible that they curdled due to a change in temperature or acidity. This can cause small bits of solid clumps to form in the soup.

* Lumps of flour or cornstarch: If you used a flour- or cornstarch-based thickener in your soup, it is possible that it did not dissolve completely, resulting in small clumps of white material floating in the soup.

* Bits of potato: Sometimes, small bits of potato can break away during cooking and float to the surface of the soup. These can be mistaken for white stuff.

* Spoilage: If the potato soup has been left out at room temperature for too long, it is possible that it has spoiled and bacteria have started to grow. This can cause small white colonies of bacteria to form in the soup.

* Rice: Many home cooks add rice or barley to their potato soup. If the rice is overcooked it will disintegrate and look like white flakes.

If the soup tasted good and you did not notice any changes in texture, it is likely that the small bits of white stuff are harmless. However, it is always best to err on the side of caution and discard any food that you are unsure about.