Having Sunday company makes me no longer feel lonely, but after a long time, I still feel a little bored, and I think I should find something to do, but what else can I do on this island, but to catch seafood to wrap my belly.

Since there are no knives, the seafood is laboriously cleaned by hand, sprinkled with lemon juice and left on the fire.

Looking at the seafood roasting on the fire, it suddenly occurred to me that I should make a knife, but what material should I use to make a knife?

It's hard for a good woman to cook without rice, and it's impossible for me to make a usable prop on this desert island, because I don't have any tools or ingredients.

However, these days are the ripe harvest of lemons, but there is something to do, I pick ripe lemons and put them in the shade of the hut, occasionally take half of the lemon sour to cool off, or dilute it with water to make a sour drink.

I've eaten a lot of lemons these days, and I've saved a small amount of lemon peels, and looking at the lemon peels in the corner, I suddenly thought of a way to make props, which can be said to be a wonderful way.

I remember once my wife bought some oranges and lemons, I don't like to eat them very much, but my daughter likes to eat oranges, and for some reason my daughter just likes to smell the orange peel, and sometimes naughtily squeezes the orange peel and sprays the water into my eyes.

My daughter is naughty and can't help who makes the hungry like it, and to my surprise, my daughter can dissolve the foam with the water squeezed out of the orange peel, I was surprised by this phenomenon, the daughter told me that it was learned from the kindergarten children, and the daughter said that the boy dissolved the foam with the orange peel and made a small ball to play with.

I'm very puzzled about what this phenomenon is, and I immediately went to Baidu to know that this is a chemical reaction, as for the molecular formula and professional name of the chemical reaction, I can't remember, in short, Baidu said that it was dissolved and solidified again, and its hardness can exceed the hardness of metal iron, and it can be used as a knife, but this kind of foam knife has very poor toughness, to put it bluntly, it is very brittle and can not cut hard items such as bones.

I also found videos online of making props out of foam, and I thought I should try it and make a knife out of lemon zest and foam trash here.

So I started making a styrofoam knife step by step according to the method in the online video, but I also took my own ideas.

I clearly remember every step of making a styrofoam knife, first mash the lemon peel, add water to filter, and then heat and evaporate the filtered lemon peel water, the evaporated liquid can dissolve the foam, pour the dissolved foam into the mold and solidify it again, a foam knife is made, and finally the prop is sharpened to cut things.

It seems like a simple step, but it is also a big challenge for me now, I first collect the foam and clean it, find a piece of wood and carve a mold in the shape of a knife.

The most important thing is to distill lemon peel water, I poured the filtered lemonade into the gas cylinder, and found a bamboo with a thickness of more than half a meter and the mouth of the gas cylinder, opened the bamboo lattice and inserted it into the mouth of the gas cylinder tightly, and finally slowly evaporated the lemonade over low heat.

It took me a day to distill about 300 ml of lemon peel and I called it lemonade because it smelled like a strong lemon.

I made some glass powder according to my own idea, because I thought that adding some glass powder to the foam solution would increase the sharpness of the knife after the glass powder solidified.

Making glass powder is very simple, smash the bottle into small pieces, and then use the stone to continue grinding until it is ground into fine sand, of course, the finer the better, but the tools are limited, it is difficult to grind the glass very fine, and finally sift it with water to get pure glass sand.

Everything was ready and the next step was to implement it, and I was still a little excited in my heart, this was my first chemistry experiment on a desert island, and I didn't know if it would be successful.

Following the steps, I first put the clean and impurity-free foam into the lemonade to dissolve, it was really amazing that when I put the foam in the lemonade, the foam dissolved quickly.

When the volume of the dissolved foam is enough to make a knife, I stir it a few times with a small wooden stick, then pick out the solution, quickly put it in clean fresh water to wash it, and finally pick it into a mold and put it next to the fire to dry.

The steps of making the second foam knife are basically the same as the first one, except that the glass powder is added to the foam solution at the end, and the glass powder and the foam solution are quickly kneaded evenly by hand and then put into the mold for shaping.

Since I had no experience in making foam knives, I didn't know if I would succeed, so I left the foam knives overnight and waited until dawn to see if my foam knives were successful.

After a night of anticipation, I found out that the foam knife I made was successful, and both foam knives were successful.

Both knives are 30 cm sharp knives, the thickness is thicker than ordinary knives, which should enhance the strength of the knife, I have a sense of accomplishment with two foam knives, not to mention that on this kind of desert island is in the real civilized society can be a few people can make such knives.

Now I am full of confidence, if there is really a human race that can survive the end of the world, the person who can survive is a smart person like me, I will definitely lead the surviving people to create a new era.

I happily said to Sunday, who was leaning on the wall of the hut, "Brother, we made it."

I spent a few more days sharpening the two foam knives to make them sharp, but I had to use a lot of water to cool them down during the grinding process.

The reason is that the hardness of this foam can exceed that of iron, but its melting point is very low, and the high temperature generated during grinding will damage the knife body, so it is necessary to continuously add water to cool down.

I added the handle to the foam knife so that the two foam knives are more perfect and more convenient to use, especially the glass powder is added to cut things faster, but the appearance is a little ugly, but it does not affect the use, but this foam knife must not cut hard objects.