The action of stabbing the kidneys and cutting the throat of the robed brothers was almost mastered, and Sun Yi said loudly:

"Walking the rivers and lakes, in addition to the ability of self-defense, you also have to master some side ways. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 infoI have some tricks here that might be useful to you. ”

As he spoke, Sun Yi handed over the chicken feather post in his hand to a dragon,

"On this piece of paper, I just dipped a tree branch in urine, and now that the paper is dry, I can't see anything, but it can be seen by roasting it slowly over low heat."

A dragon took the chicken feather post and read it several times.

This post was hand-drawn by a dragon yesterday, and there is nothing out of the ordinary.

A dragon immediately ordered a scythe to make a fire.

More than a dozen robed brothers surrounded them, only to see a huge thick brown five-pointed star gradually appear on the white paper.

This trick was actually learned by Sun Yi and Lenin.

Later Chinese textbooks have told "The Story of Six Inkwells". One year Lenin was arrested by the tsarist government, he kneaded bread into an "inkwell", filled it with milk, and wrote in milk in the blank space of the book. When the milk is dry, as soon as it is roasted on the fire, the words will be revealed. Lenin was very careful when he wrote, and as soon as he heard the door knock, he put the "inkwell" in his mouth and chewed it. One day, in a letter to his comrades, Lenin humorously said: "Today I was really unlucky, I ate six inkwells in a row. ”

In fact, not only milk, but also organic solutions such as vinegar, juice, and urine can be used as ciphering potions, and the proteins in these organic solutions will change color under the roasting of fire.

Later generations of Poland exhibited secret letters of communication between women in Nazi concentration camps and the outside world, written in urine in normal letters.

An elderly robe brother snatched the chicken feather sticker, looked at it carefully a few times, and suddenly reached out and took out a few white stones from a pocket he carried with him, and threw them far away.

"I knew that I could carry urine with me, what am I doing with this broken alum all day long!"

Several robed brothers burst into laughter.

Yilong quipped, "Fifth brother, you can fill your treasure bag with urine at any time in the future." ”

Sun Yi couldn't help but laugh.

He knew that similar secret writing techniques in ancient China were made of alum, called "alum book", which could also be revealed by roasting over fire.

However, he became interested in the fifth brother's treasure bag.

"Fifth brother," Sun Yi said as he learned the name of a dragon, "what do you usually have in your treasure bag?" ”

The fifth brother replied honestly, "It's all things that you can't say when you can use them." ”

The fifth brother showed Sun Yiyi his treasures one by one.

The fifth brother's treasure bag is divided into several small pockets, food, use, and all kinds of strange tools...... There is also a piece of copper wire that Sun Yi just sent.

Among them are also medicines: trauma medicines, poisons and antidotes.

The poison is the famous arsenic.

The antidote is blue alum.

Just looking at these medicines, Sun Yi felt the danger of the rivers and lakes.

Sun Yi asked curiously, "No sweat medicine?" ”

The fifth brother shook his head, "That thing has long been lost." ”

Sun Yi picked up a blue alum.

Blue alum is also called bile alum, copper alum, and the chemical molecule is copper sulfate.

The fifth brother introduced that blue alum can induce vomiting, and if the poison is taken for a short time, taking blue alum can spit out the poison.

This alum is blue, and at first glance it is recrystallized, as translucent as a jewel.

Sun Yi said unceremoniously: "I need a lot of blue alum, how many do you have?" ”

The fifth brother returned: "I still have some in my shack. If you want more, you have to go back to Shaanxi to buy it. ”

Sun Yi asked: "Is Shaanxi easy to buy?" ”

The fifth brother replied: "It's good to buy, Shaanxi is out of blue alum." This is a fried alum, bought at a pharmacy. If it's coarse, it's as much as you need to go to the mine. ”

Sun Yi looked back and said to Yilong: "You write down this matter, you have the opportunity to do more blue alum, and other green alum, green alum, alum, and hao alum, if you are comfortable, also do a little bit." ”

Sun Yi observed the famous arsenic again, Pan Jinlian was the Wu Dalang who killed him with this thing.

The chemical component of arsenic is arsenic trioxide, which is easily absorbed by the respiratory system, digestive system and skin.

The fifth brother actually put the arsenic in a bag with food and use!

Sun Yi unceremoniously threw arsenic for the fifth brother.

The fifth brother was just about to say something, but Sun Yi stopped him.

Sun Yitiao said to the dragon: "Early tomorrow morning, find Ha Laocai to ask for Shui Yang Dan, and give a few to each of the robe buddies." ”

Sun Yi looked at the fifth brother again and again, and said slowly: "Actually, the nitrate used by the border army is poison. ”

A dragon's eyes widened and waited for the following.

The fifth brother shook his head like a rattle, "Impossible, impossible, nitrate is specially added when marinating meat, how can nitrate be poison!" ”

Sodium nitrate tastes the same as salty salt, and can indeed be used to marinate meat and make sausages. Moreover, the meat treated with sodium nitrate has a ruddy color and is particularly bright and beautiful.

In later generations, there were restaurants that used sodium nitrate instead of salt to stir-fry vegetables, just to look good.

Sodium nitrate itself is not toxic, but sodium nitrate decomposes when heated to 380°C to produce sodium nitrite. Stir-frying with sodium nitrate instead of table salt is murder!

The minimum lethal dose of sodium nitrite for humans is 5 grams, which is the amount of one scoop in a salt shaker. Half of the lethal dose of sodium nitrite is less than 12 grams - in other words, more than half a scoop of sodium nitrite in a commonly used porcelain spoon can poison half of the users.

Sun Yi said to the fifth brother: "Just like the border army dispenses gunpowder, use tiles to isolate the fire and cultivate nitrate, and the nitrate can be turned into poison!" ”

Sun Yi explained in detail: "If you want to get high-purity poisonous nitrate, you can heat the nitrate and the lead seeds of the three-eyed gun together until it melts, stir and continue to heat until the lead turns into an earthy yellow lead yellow. ”

"Use hot water to dissolve the poison, and the hot water can be used directly as poison; It can also be boiled dry like salt and then precipitated to produce toxic nitrate. ”

"The rest of the lead yellow, plus a little toner with gunpowder, and then heated, will turn back into lead, and there is no waste at all."

"These things are all on the border army, just use them now!"

Sun Yi said again:

"Poison nitrate tastes the same as salt, at least one and a half dollars can poison people, and a little insurance can use four yuan."

Yilong commented: "It's convenient, the toxicity is worse than arsenic, but the advantage is that it can be disguised as salt." ”

Sun nodded.

The fifth brother asked: "Arsenic can be measured with a silver needle, can poison nitrate be measured with a silver needle?" ”

Sun Yi replied with certainty: "No!" ”

In ancient times, due to technical limitations, arsenic was mixed with a large amount of sulfur or sulfide. Silver is easy to chemically change with sulfur to form black silver sulfide, so silver needles are often used to test for poison.

Sun Yi's poisonous nitrate has nothing to do with sulfur, so he is not afraid of silver needles at all.

The fifth brother immediately commented: "That poisonous nitrate is much better than arsenic!" ”

The fifth brother put the treasures back into the treasure bag one by one.

Sun Yi saw that the sky was not completely dark, and a sentence came out without a head:

"Fifth brother, don't put the copper wire back yet. This copper wire can not only kill, but also eat! ”