After Huang Hanhan put away the paper bag used to hold the snuff bottle, he picked up a special lampshade from the desk to replace the original lampshade of the desk lamp.
After replacing the lampshade, Huang Hanhan turned on the desk lamp. In an instant, the brightness of the desk lamp illuminated the entire room, making everything clearly visible.
Looking at such a lighting effect, Huang Hanhan couldn't help but nodded, looking very satisfied.
Then, she picked up a small glass bottle on the desk, unscrewed the bottle cap, sucked a few drops of the liquid in the bottle with a dropper, and gently applied it on the shell of the snuff bottle.
This is a special liquid that is specially used to reveal fingerprints left on the surface of objects.
While waiting for the liquid to take effect, Huang Hanhan took a pure black pad and placed it on the desk to use it as the background of the snuff bottle.
This special liquid was indeed very useful. It didn't take long for several clear fingerprints to appear on the shell of the snuff bottle.
After Huang Hanhan placed the snuff bottle flat on the black pad, he picked up the camera and began to take photos and archive the fingerprints on the snuff bottle.
After confirming that all the fingerprints had been photographed, she got up and walked into the temporary "darkroom" that had been set up for developing photos when she left the room this morning, and began to develop the film negatives in the camera.
The photos in this film include the photos taken during the investigation of the crime scene this morning, as well as the photos of the fingerprints left on the snuff bottle that were just taken in the room.
After taking the film out of the camera, Huang Hanhan steadily operated the steps of developing the photo, including washing, developing, stopping development, fixing, washing, and drying.
After Huang Hanhan hung the developed photos one by one on the wire in the "darkroom", he finally let out a sigh of relief.
Looking at the developed photos in front of him that were just waiting to dry, Huang Hanhan felt a sense of accomplishment.
In the process of using cameras and developing photos in Anqiu, Huang Hanhan was the most attentive person among Xie Liuyun and others.
She feels as if she is born to like this art of light and shadow, and likes to use a camera to take pictures of the beautiful scenery and things she sees.
Huang Hanhan enjoyed this learning process very much.
Therefore, Huang Hanhan's ability to use cameras and develop photo techniques were second to none among the "Four Davids of the Yong Family" and received special praise from Yong Ming.
Now, looking at these photos that he took and developed by himself, Huang Hanhan feels completely satisfied.
After briefly checking the photos waiting to be dried, Huang Hanhan walked out of the "darkroom" after finding that there were no problems.
What she needs to do now is to conduct a laboratory test on the powder in the snuff bottle.
Huang Hanhan took out a mask from his suitcase and put it on his face to protect his mouth and nose to prevent himself from accidentally inhaling the powder during the test of the powder in the snuff bottle.
She put on the work gloves she had put on the desk before entering the "darkroom" again.
Huang Hanhan did not choose to pick up the snuff bottle immediately, but squatted down, carefully inspected the outside of the snuff bottle, then reached out and gently picked it up, and walked to the desk where the microscope, test tubes, alcohol lamps and utensils were placed.
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Huang Hanhan carefully opened the lid of the snuff bottle, then used a glass piece to connect it from under the mouth of the snuff bottle, and poured a little from the snuff bottle onto the glass piece.
Then, Huang Hanhan placed the glass piece with the powdered medicine on the desk, quickly picked up the lid of the snuff bottle and re-covered the snuff bottle.
The powder poured out of the snuff bottle was carefully divided into three parts by Huang Hanhan for separate testing and identification.
Among them, two were put into two test tubes for inspection and testing respectively.
One was dropped into a reagent to test what kind of chemical reaction the powder would have after encountering chemical reagents.
The other test tube was installed on a special rack and placed above the alcohol lamp, ready for heating and burning.
After finishing these things, Huang Hanhan took the glass piece with some medicinal powder on it, spread the powder evenly with another glass piece, and placed it on the observation platform of the microscope.
After selecting the medium magnification lens of the microscope, Huang Hanhan sat down and began to carefully observe and analyze the medicinal powder through the microscope.
After a long observation, Huang Hanhan selected the high-magnification lens of the microscope and continued to make further observations on the medicinal powder taken from the snuff bottle.
Afterwards, Huang Hanhan opened the experiment record book and began to record in detail what he observed.
After recording the microscopic observations, Huang Hanhan picked up the test tube dripping with chemical reagents and looked at the chemical changes caused by the Chinese medicine powder in the test tube.
In order to confirm that this chemical change was stable, Huang Hanhan took the test tube and rocked it from side to side so that the medicinal powder could fully integrate with the chemical reagents.
After such thorough shaking, Huang Hanhan once again observed the chemical reaction of the medicinal powder in the test tube.
After these two observations, Huang Hanhan recorded the final chemical changes caused by the final medicinal powder and chemical reagents in the experimental notebook.
Finally, all that is left to do is to conduct a heating and burning experiment on the portion of the powder in the test tube.
In order to ensure the safety of the experiment, Huang Hanhan walked to the window of his room and opened it for ventilation.
The rooms arranged for them by the Hangzhou branch of the "Yongran Pavilion" did not face the street. The doors and windows opened were in the inner courtyard of the pavilion, which was very safe.
Without worrying about safety issues, Huang Hanhan was very relieved to open the windows for ventilation.
When doing experiments and testing, you need to have this kind of self-protection awareness.
Just like a soldier on the battlefield, you must first protect yourself so that you can better use the weapons in your hands to fight the enemy.
A soldier who is not good at protecting himself may be a brave and good soldier, but he will definitely not be an excellent soldier.
Huang Hanhan stood in the center of the room. After feeling the "passing wind" blowing around him, he walked to the desk and lit the alcohol lamp directly under the test tube with a match.
As the flame of the alcohol lamp heated the outside of the test tube, the powder in the test tube began to react, and a faint white smoke began to appear from the top of the test tube.