Some foods that are sour are lemons, grapes, and tamarind. Some types of Oranges and some melon can also have a sour taste to them.
No. Citric acid is used in many dyes requiring an acid, and in many foods for its sour taste, but it does not color anything. Here is a full description of the properties: https://en.wikipedia.org/wiki/Citric_acid
They are sour
toxic waste sour candy, the sourest candy in the world. I guess it counts for substance too.
Oxalis montana
Acetic Acid
sour tasting foods are acids.
They will eat certain sour foods, but don't really prefer them. They have been known to eat moderately sour foods, such as yogurt, without a problem, but will not eat lemons or other citrus. They generally stay away from sour drinks.
sour milk
yes
I have never noticed a sour taste in my dairy foods. You are possibly letting it get over date.
Citric Acid
lemon, lime, vinegar, sour sweets, unripened fruit,
acids
Some foods include yogurt, cheese, and sour cream
Probably , sour .
To make sour the foods !
Because your a fatty