Chapter 784 An unexpected harvest in the darkroom
After hearing Ao Fei's answer, Qu Bing felt it was a pity that such a vivid portrait was right in front of them, but it was a pity that they could not keep the painting.
Ao Fei opened the doors and windows in a decadent manner, and turned off the calcium carbide lamps, but he did not put away his set of photography equipment, and just left it there. Qu Bing was still looking around and found that under the natural light conditions after opening the doors and windows, he could still leave a reflection on the frosted glass in the box. Thinking about it, he couldn't help but discuss with Ao Fei.
"Brother, what conditions do you think can be met to leave the inverted image?"
Although Ao Fei didn't know the method, he had already come up with a clear idea, and he listened to his analysis, "You said that what we are seeing now must be an optical phenomenon, right?"
"Yes." Qu Bing nodded immediately.
"Our goal is to leave the inverted image of the light on the board, right?"
"Yes, then what?" Qu Bing nodded again.
"So we should think of a way to make a board that can change as long as it is exposed to light. This may play a certain role, even if it is just a direction. This way I will have the motivation to continue researching.
You don't know, I have tried many kinds of materials, such as wood, bamboo, copper, iron, lead, silver, gold, tin, and glass. I have tried almost all the things that the Han tribe has now. I have also done experiments with different exposure times and comparative exposure experiments with natural light and light, but those things have no reaction at all. I am about to give up." Ao Fei immediately counted on his fingers indignantly to Qubing.
"Then brother, have you ever thought of trying from other aspects?" Qubing asked again.
"What aspect?"
"Chemistry, chemistry can always make objects produce incredible changes. Why don't you ask the chemistry group to help with the research? They are also very good at studying these things that glow, burn, and so on." Qubing reminded.
"Are you talking about their No. 17 metal sulfate reagent that can gather light at night? I tried it, but it didn't work. It won't help me take photos at all." Ao Fei said helplessly.
"It's not that. Hehe, to tell you the truth, when we were making explosives a few days ago, we actually made an explosive that was very sensitive to light. As long as it was exposed to light, it would quickly turn black in just a few breaths." Qu Bing said with a smile.
"Explosives have this property?! Are you kidding me?" Ao Fei stood up excitedly.
"Of course, it's silver nitrate. Why would I lie to you? If you don't believe me, come with me to the chemistry group." Qu Bing stood up and said without showing any weakness.
"Then what are you waiting for, let's go."
Unexpectedly, Ao Fei was more excited than him, and he dragged Qu Bing to the laboratory of the chemistry group on the spot.
The two explained the situation and wanted to use silver nitrate to do photosensitivity experiments, but because silver nitrate was too sensitive to light, normal experimental methods could not produce finished products at all, or in other words, the finished products could not be preserved at all, and they would soon become ineffective due to exposure, so there were no finished products in the laboratory.
Ao Fei was not discouraged. He immediately said that he would move the experimental site to his darkroom and conduct the experiment in the dark. However, the chemical group disagreed. Silver nitrate is a highly sensitive explosive. It is dark and you can't see anything. How can you ensure the safety of the experiment? If the things are not produced and people are killed, they can't afford this responsibility.
Moreover, concentrated nitric acid is highly corrosive. Those common metals will melt into liquid immediately when they encounter fuming nitric acid. Wen Nong rejected their experimental plan on the spot.
Ao Fei was certainly unwilling to give up. In the end, Qu Bing proposed to use silver nitrate aqueous solution for the experiment. This solution also has a strong photosensitizing effect, but it is not as dangerous as pure silver nitrate. Although it is also corrosive, it can be diluted with water, and the acidity has been weakened a lot. The most important thing is that it will not explode.
After listening to Qu Bing's proposal, Wen Nong finally agreed to give them a bottle of silver nitrate aqueous solution for the experiment.
The two of them were immediately overjoyed. They took the dark brown light-proof glass bottle containing the solution and ran to the darkroom to start tossing.
"Brother, why don't we start the experiment with glass first? Glass is relatively stable and not prone to danger." Qubing suggested.
"Okay, I'll listen to you, but we still have to turn on the light, otherwise it's really dark and we can't see anything." Ao Fei asked.
"No, we can't turn on the light. This solution can only be stored in a dark brown light-proof glass bottle. It will be ruined once it is exposed to light." Qubing immediately rejected it.
"But the dark brown glass bottle is also light-transmissive. Is it that only the dark brown light has no effect on it? This is easy. Our optical group happens to have a calcium carbide lamp of this color. Wait, I'll take it."
Ao Fei said and went to the equipment room not far away, took a calcium carbide lamp with a dark brown glass lampshade, then lit the flame, put down the lampshade, and closed the doors and windows. Immediately, there was only a dark red light left in the room. Although it was very dim, objects could still be seen clearly, providing lighting for their experiments.
Qu Bing thought for a while. Because the experimental material was liquid, he suggested pouring a layer of silver nitrate solution on the glass plate, letting it form a film, and then taking it behind the box for exposure. Maybe some reaction would occur.
Ao Fei immediately agreed to this method, and then the two began to experiment.
First, the silver nitrate solution was evenly poured on the glass, and then after drying in the shade, it was exposed in the wooden box to avoid light, but the result was nothing. The glass was still the same piece of glass, and there was still no reaction on it. Both of them were a little disappointed.
However, Qubing was very positive about this, so he went to ask Wen Nong, the leader of the chemistry group. Wen Nong's reaction was to laugh and cry.
"What are you going to do? Even if you let nitric acid react with photosensitivity, it won't have any effect if you don't use other materials to replace the silver and analyze it." "
What should we do?" Qubing asked dejectedly.
"You want it to react, right? Take this, sodium sulfite solution, and mix it with your solution. It is guaranteed to react."
Qubing took the solution given by Wen Nong and left half-believingly. Then, according to him, if the silver nitrate solution was mixed with this, it would definitely react, but the two obviously didn't want it to react so violently.
So Qubing suggested, "Why don't we soak the glass that has been coated with silver nitrate and exposed to light in this and try it?"
"Okay, I don't know as much about chemistry as you do, you have the final say." Ao Fei nodded indifferently and agreed to Qubing's plan.
The two immediately started to conduct experiments in the darkroom.
Qubing poured the sodium sulfite solution given by Wen Nong into a waist-deep porcelain plate, and then soaked the exposed glass in it. The next second, something incredible happened.
The glass slowly showed an image under the annotations of the two people. It was the picture that was exposed before. The background was the wall, one side was a reflector, and the other side was a window. Ao Fei sat on a chair seriously, which just formed a full-length sitting picture.
The image became clearer and clearer on the glass until it became lifelike. Both of them trembled with excitement.
"Brother, look, it's out, it's your shadow."
"Yes, I see it, it's great, Qubing, you are really my lucky star. You have mastered this technology as soon as you came.
Oh? Oh? No, why is it blurry again? Oh? Why did it disappear again? Damn it, what's going on?"
Just when the two were excited, they saw that the photo that appeared on the glass went from blurry to clear. After only a dozen breaths, it turned into a blurry image of black and white again.
Only a rough outline of the figure could be distinguished, but the details of the lifelike facial features that they had just seen were all blurred, which made the two of them very angry. They had obviously succeeded, but in the end it was ruined. How could they not be angry?
However, after staring at the glass for a while, Qubing suddenly discovered something unexpected.
"Brother, look at the back of this glass, is there silver precipitated? Why do I feel that this glass has become a mirror? Look, the place with silver on it can reflect light!" Qubing said in surprise, pointing to the glass soaked in medicine in the porcelain dish.
Upon hearing what he said, Ao Fei quickly leaned his head over, and it was true. The dark parts in the blurred image had silver precipitated, forming a mirror effect on the other side of the glass.
This magical scene made him laugh and cry. He wanted to develop the technology to keep pictures, but he didn't come up with the method of making silver-coated glass mirrors. This was too speechless.
(End of this chapter)
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