The identification and analysis of fingerprints should begin with fingerprint collection.

The quality of collected fingerprints fundamentally determines the difficulty and likelihood of success of fingerprint identification and analysis.

The fingerprints on the painting frame have already been collected by Lu Chuan.

This time, Lu Chuan did not use the usual silver powder or the infrequently used copper powder but employed a magnetic adhesion method for collection.

This is because the material of the painting frame is comprised of composite panels pressed from fragmented wood and then coated with lacquer.

Compared to several commonly used fingerprint collection methods, magnetic adhesion is the most effective for collecting fingerprints from such surfaces, causing the least damage to the fingerprints.

Additionally, because of the twisting of fingers during transportation, many of the fingerprints on the frame have smudges.

This fingerprint collection is also suitable for using the magnetic adhesion method.

"Master, the fingerprints on the frame are mixed. During back-and-forth handling, multiple people likely left fingerprints. Whether there are fingerprints of suspects among them, it's hard to say."

Liu Guodong nodded.

Just now, news from the action team came in that the painter who signed the artwork has been found, but he claims that he never painted the girl in the wheat field.

Therefore, who the culprit is cannot currently be determined.

"The focus now is on collecting fingerprints from the paint and skin. This time you handle it. If you need our cooperation, just arrange it."

Lu Chuan nodded: "I'll give it a try first. There are some things I need to discuss with Shen Yan."

Lu Chuan has a method for collecting fingerprints from the paint, but collecting possible fingerprints from the skin will likely require damaging the resin paint on top.

This will affect the skin itself, so naturally, forensic doctor consent is required.

In the laboratory, Lu Chuan turned off all the lights and used a handheld ultraviolet lamp to scrutinize the paint inch by inch.

Oil paintings differ from traditional Chinese paintings; the pigments themselves have a granular feel, and artists can use varying shades of lines during painting to reflect changes in space.

Therefore, oil paintings appear more realistic, with stronger contrasts between light and dark, and a greater sense of spatial depth.

However, this is not a good thing for fingerprint collection.

The wheat waves on the painting seem as if they are truly swaying in the wind.

Amidst the undulations, Lu Chuan has already discovered some fingerprints.

However, these fingerprints have numerous breakpoints; nearly every fingerprint ridge has breakpoints.

Additionally, the paint of this oil painting is mineral-based, containing elements such as sodium, iron, and copper.

So, under these circumstances, regular physical and chemical methods become ineffective.

This time, Lu Chuan still needs to rely on a variable frequency laser spectrometer for fingerprint development.

However, unlike developing fingerprints on paper, on an oil painting, the required laser wavelength for development is variable.

Fortunately, the Intermediate Fingerprint Collection Skills includes experience in this area.

Lu Chuan only needs to continuously adjust the wavelength to develop fingerprints on different pigments and then photograph each segment to piece together the entire fingerprint for collection.

In the dark laboratory, Lu Chuan kept adjusting the laser frequency of the instrument, and the fingerprints flashed segment by segment.

Liu Guodong cooperated by photographing each fingerprint fragment.

Meanwhile, while Lu Chuan was extracting fingerprints from the paint, questioning by the second action team was underway.

However, the results were not promising.

Exhibition Hall Supervisor Zhang Bin.

"I really do not know how this painting came to be here."

"You just checked the specific data; the artist is a grassroots painter from Haizhou named Liang Song, so you should ask him."

The exhibition setup supervisor.

"These paintings are all donated, except for a few slightly more valuable ones, which are on loan. The others were either voluntarily offered by the artists or invited by us to be displayed in the exhibition hall."

"Do you have no review mechanism for your exhibitions?"

"We do, but there aren't many painters in Haizhou to begin with, and even fewer quality works. As long as they are decent, we'll include them in the exhibition."

"This time, the art exhibition did not have high-level requirements. Although Liang Song is a grassroots painter, he is quite well-known in Haizhou City."

"How did this painting enter the exhibition hall? Who transported it? From where was it brought?"

"Just Thursday, the setup was completed only the day before yesterday. We have a professional transport team. The painting was directly collected from Mr. Liang Song's studio by our staff…"

In the interrogation room handled by the first action team.

Liang Song is a man in his fifties with a small beard, exuding an artistic uncle aura; at this moment, in the interrogation room, there was none of the usual tension or fear in his eyes.

Sun Jun could see that Liang Song seemed curious, constantly observing everything around him.

"Mr. Liang, you don't seem nervous at all?"

Liang Song stopped his observant gaze, looking at Sun Jun: "Why should I be nervous?"

"Not many are this calm after entering here."

"That's because they did something wrong. I haven't done anything illegal, so there's no reason to be nervous, but…"

Liang Song's tone shifted: "When I go back, I could paint an artwork based on this interrogation experience, calling it… might as well call it Freedom, what do you think?"

Freedom?

Sun Jun was speechless: "Mr. Liang, I think Losing Freedom might be more appropriate."

"Alright, let's talk about your painting."

Liang Song shook his head: "I already mentioned it in the car; that painting was not done by me."

"Although I often paint wheat fields and rural themes, the girl in the wheat field you mentioned wasn't painted by me, truly."

"But the painting bears your signature, and according to the exhibition venue's account, this artwork was indeed transported from your studio."

Liang Song frowned deeply: "Officer Sun, I really have no idea what's going on."

"I am aware of this art exhibition. They sent me an invitation."

"I agreed to have my paintings exhibited, and to be honest, I hope they display my works."

"As a grassroots painter, without a mentor, I've only learned through exploring painting myself."

"So, I cherish this exhibition opportunity."

"Also, when you showed me the photo of the artwork in the car, I immediately knew that the painting of the waving wheat was indeed well done, but it wasn't mine."

"The painting I originally provided them was called 'The Well Beside the Field.'"

"The name of the painting is included in the response letter to the exhibition hall."

"If you don't believe me, you can visit my studio. If there has been an error, 'The Well Beside the Field' should still be there."

"Additionally, to determine whether the artwork is actually mine, you can invite some renowned artists for appraisal, which shouldn't be difficult…"

At 6:28 p.m.

Conference Room 1, where Qin Yong chaired the first case analysis meeting.

"Action teams, crime scene investigation, and forensic units, please share what progress there is now."

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