In Conan, people have a brain option system.

Chapter 131: Techniques for Covering Fingerprints (23)

This morning, Akikawa Sosuke didn't eat anything, but just drank some water.

Because Akikawa Sosuke considered what might happen today, he gave up eating in order to lower his blood sugar.

Akikawa Sosuke's physical condition is not very good to begin with, and he would easily feel dizzy if he didn't eat breakfast.

But one benefit of lowering blood sugar is that it will make your complexion paler.

Akikawa Sosuke thought that by using this point, he might be able to confuse Toda Kyoushi's judgment.

Make him think that he turned pale because he was panicked because he had guessed the truth.

After "eating" breakfast with Itakura Misaki, Akikawa Sousuke went back to his room before going to the film festival exhibition area together.

This time when he went back to the room, he was preparing in advance for a possible frame-up plan.

Because Akikawa Sosuke took into consideration that Toda Kyoushi did not have any leverage to stop him from telling the truth.

Therefore, things cannot be done as carelessly as what Koichi Nishihara and Takao Ohkawa did.

So when he wanted to use the "murder weapon" prepared by Kenji Ueda to frame someone else, he could not leave any traces of having touched the weapon.

The most important point is to cover up fingerprints and palm prints.

At this time, the candles and lighters obtained from Ohkawa Takao came in handy.

Although Akikawa Sosuke's freedom is not restricted, it is completely possible for him to go to the supermarket or convenience store to buy the props needed to implement the plan.

But the reason why Akikawa Sosuke didn't do so was that he didn't want to leave any hidden dangers.

Because once you enter or leave a supermarket or convenience store, there will definitely be evidence left in the store’s surveillance.

What if a detective or some police officer really suspects that I deliberately covered my fingerprints and investigates the surveillance footage?

Then Akikawa Sosuke is still at risk of being exposed.

Therefore, the safest way, of course, is to use existing things to cover up fingerprints.

When paraffin is heated and applied to the hands, it forms a wax film that can hide fingerprints.

And one good thing about paraffin is that it can be removed with just your fingernails.

But correspondingly, one of the biggest disadvantages of paraffin is that its strength is too low.

In order for Akikawa Sosuke's plan to frame someone to go smoothly, in addition to not leaving any marks on the murder weapon, there is another very important point, which is that he must let Toda Kyoushi touch the murder weapon.

Akikawa Sosuke knew that Toda Kyoushi was afraid of letting himself die, so he would definitely come to stop him.

In this case, if Toda Kyoushi clenched his palms and held the weapon in his palms, it would not be enough to just use paraffin to cover the fingerprints.

Because paraffin wax has too low strength, it can easily leave marks due to friction or force.

This certainly won't fool the detectives.

So what Akikawa Sosuke had to do was to increase the strength of the paraffin covering his fingerprints and palm prints.

This is what Akikawa Sosuke did after he finished breakfast and returned to the hotel.

Paraffin wax is composed of alkanes (hydrocarbons), and its chemical structure is a straight-chain or branched long-chain hydrocarbon.

After it is mixed with saturated fatty acids, the long-chain structure of saturated fatty acids and the alkane chain of paraffin can entangle with each other, forming stronger intermolecular forces and significantly increasing the melting point and hardness.

In addition, ester components can increase the complexity of the molecular structure of the wax, enhancing its physical strength and wear resistance.

The above items can be found everywhere in daily life, and Akikawa Sosuke can get them without going to the supermarket.

The main ingredient of the candle in Akikawa Sosuke's hand is paraffin wax. The other two things he chose to increase the strength of the paraffin wax are skin cream and lip balm.

Skin cream contains stearic acid, which is a long-chain saturated fatty acid.

Lip balm contains beeswax, which is composed of esters, fatty acids and long-chain alcohols.

By adding these three things together in proportion, heating, mixing and cooling, you can make a stronger "mixed wax".

Akikawa Sosuke did not completely apply the mixed wax to his palms.

Instead, only the thumb and index finger of the left hand, and the base area of ​​the other four fingers of the right hand from the palm to the thumb were applied.

When Akikawa Sosuke took out the dagger from the evidence bag, he used the thumb and index finger of his left hand.

As he grasped the dagger with both hands and stabbed himself,
Although the right hand is inside, what actually holds the dagger is the left thumb hidden in the palm of the right hand and the base of the four fingers of the right hand.

These two parts alone are enough to fix the dagger, and because of the presence of the mixed wax, there is no need to worry about leaving fingerprints and palm prints on the dagger when Toda Kyoushi grabs your hands.

Later, when Kyousuke Toda was trying to stop Akigawa Sosuke from "committing suicide", there was a knock on the door.

Akikawa Sosuke knew that the time had come, so he took the opportunity to step back and pull out the dagger while Toda Kyoushi's attention was distracted, and at the same time he freed his hands from Toda Kyoushi's hands that held the dagger.

As a result, the dagger was thrown into Toda Kyoushi's hands.

To outsiders, this scene looked like Toda Kyoji had pulled the dagger out of his own neck.

Because Kyoushi Toda knew that he had grabbed the dagger.

Then when the forensic police officers found that there were no fingerprints on the dagger, he would definitely guess that he had used some method to cover up the fingerprints.

In order to eliminate this possibility again.

While Conan was trying to control his bleeding, Akikawa Sosuke grabbed Conan's left arm with his bloody right hand.

Since Akikawa Sosuke only applied the mixed wax on a small area from the palm to the base of the fingers on his right hand, the palm prints and fingerprints would still be clearly left on Conan's clothes.

Although no palm prints will be left on the area where the mixed wax is applied, since blood itself will spread when it gets on clothes, as long as there is blood in the palm area, a clear palm print will be left.

In this way, as long as Akikawa Sosuke lightens the force with his five fingertips when grasping the arm of the Shinigami elementary school student, the fingerprints of his bloody five fingers will be clearly left on Conan's clothes.

This also proves that there is nothing smeared on his right hand.

At that time, as long as Kyoushi Toda points out that he had smeared something on his right hand to cover up his fingerprints, he would definitely be considered a liar.

In this way, he could put the blame on Toda Kyoushi by committing suicide.
It also transformed itself.
It turned out that Kyoushi Toda wanted to kill himself and tried to cover up the truth.

Finally, how do you remove the enhanced strength wax blend from your hands?

Since the mixed wax is much stronger than ordinary paraffin wax, it cannot be easily removed with fingernails like paraffin wax.

At this time, there are two ways to effectively remove the mixed wax.

One way is to heat it again to soften it.

Another method is to use ethanol to dissolve some of the wax and oil components to soften them.

Akikawa Sosuke, whose neck was attacked by a dagger, certainly had no condition to heat the mixed wax in his hands.

However, if you lose too much blood, the paramedics will definitely connect a pulse oximeter to you in order to monitor the oxygen saturation in your blood.

Before connecting the pulse oximeter, you must wipe your palms with medical alcohol to ensure that there is no grease, dirt, or blood stains.

Medical alcohol has another name, which is 75% ethanol solution.

(End of this chapter)