toxic waste sour candy, the sourest candy in the world. I guess it counts for substance too.
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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.
blue clues
Solid. Most likely a crystalline.
They are sour
The most abundant metal in the Earth's crust is iron. The most abundant element in the Earth's core is oxygen.