Answer:
It cannot be seen, it weighs nothing, but when put into a barrel, it makes it lighter.
It is sometimes known to have silver linings.
I am the red tongue of the earth, that buries cities.
What asks but never answers?
Soft and fragile is my skin, I get my growth in mud. Iām dangerous as much as pretty, for if not careful, I draw blood.
Strip the skin under my skin, and my flesh you'll reveal. It tastes sweet and tart, now throw out the peel. What is it?