It was over.
Li Ang looked up silently at the clear sky.
Now that the evidence in the case was conclusive, there was no possibility of reversal. Even Commandery Prince Changxiang could not get his son out of this.
During this period, he had thought of countless ways to find evidence, but in the end, the only effective one was producing iodine and extracting fingerprints with iodine vapor.
To produce iodine, one first needed to dry kelp roots and seaweed. These were then fried in a large iron pot until they turned into black, charcoal-like substances. Next, they were boiled with water three times while stirring continuously. After filtering, the solution was heated to concentrate it. Sulfuric acid was added to lower the pH value, followed by manganese powder. Finally, the mixture was heated to sublimate the iodine vapor, which was then condensed using a spherical condenser.
