For example, we have seen in MCU that the Reality Stone was melted into a red liquid (called the Aether).
Is this possible with other Stones as well?
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I don’t think there is any explicit answer to this but I’m going to go out on a limb and say no, not by themselves anyway. We’ve never seen any of the others become a different form on their own.
Each Infinity Stone controls an essential aspect of existence and we’ve seen they act differently because of it. The Soul Stone holds a special place amongst the Infinity Stones demanding a sacrifice. The Power Stone holds immense power so only powerful beings may use it, anyone else is just over powered and destroyed as we see in Guardians of the Galaxy.
The Reality Stone changes what people perceive as, well, reality. It can turn Drax into cubes or stretch out Mantis. It can turn into the Aether, a liquid, because it is changing its own reality.
However, they could probably become liquid if the wielder of the full Infinity Gauntlet were to make them all liquid. After all if it can destroy them (reduce them to atoms), turning them to liquid should be well within its capabilities.
NATASHA ROMANONFF: Where are the Stones?
THANOS: Gone. Reduced to atoms.
BRUCE BANNER: You used them two days ago!
THANOS: I used the stones to destroy the stones. It nearly killed me. But the work is done. It always will be. I am... inevitable.