What Are Tofu Buildings?

Tofu stone is a small island country called Malta in the Mediterranean. Under the ground there is a gray-white or milk-yellow rock mine.

Tofu stone

Right!

Tofu stone is

But this very soft thing, as long as it is left to dry in the sun for a certain period of time, it will become extremely hard, let alone cutting, even if you smash it with a sledgehammer, it is difficult to break it open. Why does such a thing have such a magical nature? Just because it has a very high content of calcium hydroxide. When calcium hydroxide meets carbon dioxide in the air, it produces calcium carbonate which is extremely hard. The Maltese regard this stone, which is easy to shape and soft to process, as a "national treasure".

Malta, a small projectile island, was able to withstand the violent bombardment of Germany in the Second World War. Its sturdy "tofu stone" building and war bunkers avoided the catastrophe and stood tall in the forests of the nations of the world. "Tofu Stone" has contributed!