Chapter 642 (1/2)

Experts are experts. Not long after Gao Facai came, new news came from the assurance department.

Firstly, Gao Facai extracted a common soil microorganism from the surface of the metal box, and calculated the year when the metal box was buried in the soil through the growth cycle of the microorganism.

According to his calculation, Tao Xiang's metal box was buried there 10 to 13 years ago. Du Manting died 21 years ago. This discovery shows that Tao Xiang did not bury the box just after Du Manting was buried.

Then, heavyweight discoveries followed. Gao Facai detected the relevant time through some trace elements in the skull remains and preservatives.

It turned out that preservatives and heads were dumped in metal boxes five to seven years ago.

Five to seven years ago, it was the time when Tao Xiang stole the Tamil star. He happened to pour the head of the dead into the treasure chest at this time. What's his purpose?

Soon, Gao Facai led his team to use some chemical method to detect trace lacquerware and gold and silver powder from the scratches inside the metal box.

In this way, it can be proved that other gold, silver and lacquer ware should have been stored in that metal box. I wonder if those gold and silver lacquerware are the treasure of Tao Xiang?

Through these three discoveries, Zhao Yu and others can roughly sort out a time context:

About 10 years ago, Tao Xiang buried a metal box in Du Manting's grave. At that time, the metal box may contain many gold and silver treasures. Maybe Tao Xiang is to pay tribute to Du Manting, maybe it is because Tao Xiang needs a place to store treasures.

However, one day six years ago, Tao Xiang took the treasure out of the box and replaced it with the head of the dead!

So, the day six years ago seemed to be a key node. I don't know what happened that made Tao Xiang do that?

Is it really related to Tamil star?

If we can solve this problem, we can find the whereabouts of the treasure and the Tamil star?

Gao FA's efficiency was amazing. It was only ten minutes before noon that he made a new discovery. Through the examination of six heads, he found that the anti-corrosion treatment methods of these heads and the composition of the anti-corrosion solution soaked in the first time were different.

The older the skull, the simpler the anti-corrosion method and the composition of the anti-corrosion liquid. However, in the later stage, the anti-corrosion methods became more and more advanced and clever.

Although the discovery was shocking, Zhao Yu was prepared for it.

Because Gao Facai's discovery is very consistent with the autopsy report on the Headless Woman's corpse case.

After the case happened that year, the forensic doctors also found a law. The more headless female corpses appear in the future, the better their anti-corrosion means will be.

Therefore, the police believe that the murderer is constantly trying and making progress in the whole process of committing the crime. In the process of handling the corpse, he is also looking for better anti-corrosion methods.

Especially for Bai Lili, the body was handled quite well.