Huang Hanhan stretched out his hand above the wisp of white smoke and waved it toward his nose a few times, smelling the smell of the wisp of white smoke.
Then, with a slight frown, she picked up a pen and quickly recorded her personal feelings in the experiment notebook.
Huang Hanhan sat at his desk, staring at the heated test tube, observing the subtle changes in the medicinal powder in the test tube, and recording the changes in the experiment notebook at any time.
After almost ten minutes, Huang Hanhan used a cap to extinguish the flame of the alcohol lamp, ending the experiment of heating the powder.
During the entire process of heating the medicinal powder, Huang Hanhan had a clearer judgment on the medicinal powder contained in the snuff bottle through the smell emitted by the heated medicinal powder, as well as the state and color changes after being heated.
If combined with the reaction of the fusion of medicinal powder and reagents and microscopic molecular observation, Huang Hanhan can basically determine the properties and composition of the medicinal powder.
Huang Hanhan solemnly wrote his experimental conclusions about the medicinal powder in the experimental notebook and signed his name for confirmation.
Then, she took the two sheets of paper with detailed records of her experiments and specific conclusions from the plywood, folded them, put them in her notebook, and folded them carefully.
After replacing a new experimental recording paper and clamping it on the plywood, Huang Hanhan wrote the name of the experimental project he was going to do next, namely "Fingerprint Identification", in the experimental project column on the paper.
After Huang Hanhan finished writing the name of the experimental project, he picked up a small leather bag on the desk, took out a 60x magnifying glass from it, and began to use the excellent lighting conditions of the desk lamp to conduct detailed analysis of the fingerprints on the snuff bottle shell.
identification.
During the process of identifying fingerprints, Huang Hanhan would use a small ruler to measure the size of the fingerprints very rigorously from time to time.
She examined and identified the fingerprints very carefully, and every time she saw a fingerprint, she would record the details of the fingerprint on the experiment recording paper.
After carefully recording the details of all the fingerprints that appeared on the snuff bottle shell, Huang Hanhan carefully compared the records he made with the actual situation on the snuff bottle shell from beginning to end.
To ensure that your records are consistent with the facts.
After some verification, Huang Hanhan breathed a sigh of relief and finally recorded all the fingerprints that appeared on the snuff bottle.
The fingerprints appeared in different locations, with a total of seven complete and identifiable fingerprints. As for the incomplete fingerprints that appeared, Huang Hanhan did not record them, but only took photos and archived them.
At present, these seven fingerprints have been numbered in detail, and their specific positions on the snuff bottle are marked, making it clear at a glance.
Behind each fingerprint, three parts are listed to record the situation.
The specific contents of these three parts are characteristics, size and gender.
According to these three specific contents, Huang Hanhan made detailed identification records.
In fact, just by looking at the recording paper of this experiment, you can make a fact determination.
However, out of rigorous considerations, Huang Hanhan decided to take another look at the archived photos of fingerprints he had taken.
She got up and went into the "darkroom", looking up at the photo she had just hung on the wire.
After discovering that the photos were already drying, Huang Hanhan took the photos off the wire, gathered them together, and walked out of the "darkroom" with them.
Huang Hanhan selected the photos with these seven clear fingerprints from these photos, spread them out on the desk, and examined them again.
In order to facilitate comparison and reference, Huang Hanhan also numbered and annotated the seven photos accordingly according to his own experimental records.
In this way, no matter who is holding this information, they will know clearly where each fingerprint appears on the snuff bottle and what its specific details are.
Now, through the horizontal combination and comparison of the actual snuff bottle, archived photos and experimental records, Huang Hanhan began to formally make his final judgment on these seven fingerprints.
Based on the location of the fingerprints, the distance and angle between each fingerprint, Huang Hanhan's final identification opinion was that these seven fingerprints came from two people.
Moreover, the two people who left these seven fingerprints are both men.
Among them, two fingerprints belong to one person, and the other five fingerprints belong to another person.
Looking at the two fingerprints belonging to the same person, Huang Hanhan sat in a daze for a while, then stood up and packed the things on the table.
Huang Hanhan put the snuff bottle back into a new paper bag, and made the paper bag appear empty to better protect this important physical evidence.
Then, she took off the experimental record paper about "fingerprint identification" on which she signed the identification opinion from the plywood, folded it and put it in her notebook.
The developed photos, together with this notebook, were placed in Huang Hanhan's shoulder bag.
Afterwards, Huang Hanhan began to put the instruments and equipment he had just used back into the suitcase.
After Huang Hanhan finished doing these things, he sealed the two test tubes containing the medicinal powder properly.
After confirming that the test tubes would not leak, Huang Hanhan used a special packaging soft paper to wrap the two test tubes layer by layer.
After that, Huang Hanhan put the two wrapped test tubes into a small cloth bag, tied the mouth of the bag tightly with the rope that came with the bag, and then put the bag into his shoulder bag.
The glass piece with the powder sandwiched between it was put into the satchel without being wrapped after the same sealing process.
Obviously, Huang Hanhan was relatively relieved about these two glass pieces with medicinal powder sandwiched between them.
This is not to say that the hardness of these two glass pieces is stronger than that of the two test tubes, but because its size is relatively small and easier to carry.
After Huang Hanhan put away all the things that needed to be collected, he checked his room again and confirmed that there was nothing wrong with it. Then he closed the window he had just opened for ventilation and walked out of the room.
"Sir Huang, don't you take a break?"
Seeing Huang Hanhan walk out of the room, Quan An asked out of concern.
As a participant in this case-solving operation, Quan'an knew that after arriving in Hangzhou yesterday evening, everyone had a good rest at the Hangzhou branch of the "Yongran Pavilion" just last night.
After leaving home this morning, everyone has been working non-stop, regardless of the fatigue of the past few days of traveling. It would be a lie to say that they are not tired.