The colorful terracotta warriors and horses are instantly discolored, why are the murals in the pyra

Because it uses mineral pigments with relatively stable properties, relatively speaking, the pigments on the surface of terracotta warriors and horses are relatively unstable, so once exposed to the air, they will instantly decolorize. The frescoes in the pyramids have been tested to contain extremely rare green resin and grease used to prevent the coffin from decaying, making the artifacts of thousands of years still in their original state.

The murals in the pyramids use stable mineral pigments, including white pigments mainly composed of calcium magnesium carbonate, black pigments composed of carbon black, red pigments composed of red ochre, yellow pigments made of yellow ochre and realgar, blue pigments composed of bronze ore and Egyptian blue, and green pigments composed of malachite and Egyptian green. The stability of these chemicals is relatively good, and the mural is located in a relatively closed and stable environment, so it is reasonable to preserve it well.

However, although the terracotta warriors and horses in our country are thousands of colors, once exposed to the air, they will fade immediately, which is due to changes in the environment. Some mold spores are widely present in the air and soil, and they will grow rapidly when the temperature and humidity of the environment reach the growing conditionsThe growth of mold will secrete harmful substances such as pigments and acids and alkalis, which will accumulate on the surface of the terracotta figurine, causing damage to its appearance. At the same time,The painting on the surface of the figurines will also condense a layer of hoarfrost-like soluble salts, causing irreversible damage to the figurines.

When the temperature changes slightly, the soluble salts begin to crystallize and dissolve repeatedly, causing the painted voids to become larger, thus showing the phenomenon of fading. The root causes of terracotta decolorization lie in these, namely environmental changes, microbial interactions, and soluble salt reactionsMoreover, the temperature and humidity under the ground are different from the surface, and the terracotta figurines have always been in a state of protection, and after being excavated, they quickly lose water, and the paint surface quickly curls and peels off, which is regrettable. Therefore, in order to preserve the full appearance of the remaining terracotta figurines, the state decided not to continue excavation.

The frescoes in the pyramids are still gorgeous for thousands of years, mainly because the pigments used are different, and perhaps the pyramids are better.

The colorful terracotta warriors and horses were unearthed and instantly decolored, and the murals in the Golden Pagoda are still gorgeous for thousands of years, probably because the Egyptians used different pigments thousands of years ago, so the murals can still be preserved now and are still gorgeous.

The terracotta warriors and horses were unearthed, after the corruption of the sun and air, more or less some color will be lost, after all, the age is long, the murals in the pyramid must be with special pigments, plus he is in a closed environment, so the degree of preservation will be greater!

Why can Dunhuang murals remain unbleached for thousands of years?

Maybe it's because of the oxidation problem, the two countries have different cultures, and the raw materials used to make pigments may also be different.

The secret of the frescoes of the pyramids that are still gorgeous for thousands of years is still unknown to this day, and it is precisely because of this that it attracts a large number of tourists.

I don't know exactly why, but I think it has something to do with the unique pigments and the unique preservation methods of Egypt.