Boiling tung oil is another technical job.

Ding Qi took a clay pot and poured a pot of tung oil from the bottom, about one-fifth the size of the pot. It's not that Ding Qi is unwilling to pour so much, but he is worried that he will be boiled down and waste the oil squeezed from these tung seeds that he finally brought back.

Boiling tung oil is still a memory of the scene of the neighbor's carpenter's eldest brother boiling tung oil when he was preparing to paint the furniture. Some of the contents are a little vague, so Ding Qi has to think about the method and precautions for boiling tung oil through the boiling process.

In addition, the reason why you can't pour so much tung oil is that during the boiling process, the tung oil will bubble up a lot. If you put too much tung oil, it will cause these bubbles to spill out of the pot.

For Ding Qi, he would never have thought that when he was a child, watching other people's methods and processes of boiling tung oil would become his great skill to fool primitive people. Just look at the expressions of Jing and Tanuki, the attitude is pious, and it seems that the process of boiling like this is God teaching them skills.

Start a fire and light the firewood under the clay pot.

The red flames swept through the stove with a bang, quickly dissipating the heat contained in it, conducting it into the clay pot, and began to heat the golden tung oil. According to the knowledge in memory, the temperature of tung oil should not be too high, probably between 250 and 260 degrees. If it is too low, the impurities and water in the tung oil will not be obvious and will not meet the requirements; But it can't be too high, if it's too high, the tung oil will become honeycomb or spongy, and the tung oil will be wasted.

Therefore, the mastery of the heat is crucial, and Ding Qi can only slowly grope and find that point in time.

When the temperature rises, the tung oil starts to heat up because the water in the tung oil is evaporating. As the temperature continues to rise, some smoke floats up, and then the tung oil begins to bubble, gurgling non-stop, emitting more and more water vapor, gradually forming a water mist. The bubbles that bubbled out began to gather more and more, accumulating along the edge of the pot, and some impurities such as tung seed skin and tung seed residue were floating on it.

At this time, Ding Qi took a wooden spoon from Jing's hand and began to stir clockwise. As the stirring progresses, those bubbles begin to decrease and some fade away. And the impurities attached to it float over the edge of the pot and stick to it.

"You two have to remember that what we are boiling is pure tung oil, so he has only one way, which is to keep stirring to remove the water in the tung oil, and try to make the water in it tend to be zero or even nothing. At the same time, during the boiling process, those impurities will be precipitated and pasted on the edge of the pot. As the boiling time increases, the more impurities will increase. ”

Ding Qi explained to the two of them while stirring, and observed whether the temperature of the tung oil was too high.

"Also, keep an eye on the color of tung oil. When some of the tung oil changes from golden yellow to brown or brown as it is commonly known in my hometown, I don't put any more firewood, or even pull out some of the firewood, so as not to let the temperature in the pot get too high. If you keep it in this state, the tung oil will turn brown or brown little by little, until it is all brown. You don't have to worry about what brown or brown looks like now, I'll show you both the specifics. ”

Ding Qi lowered his head to blow the mist away, took a closer look at the color of the tung oil, it didn't seem to have changed, and casually added a piece of firewood to the stove, and the temperature of the tung oil in the pot soon rose again.

Ding Qi asked the raccoon dog to fan the wind in one direction with a wooden plank, blowing the mist away, so that Ding Qi could observe the color change of tung oil. Although there was not much mist, Ding Qi did not want it to interfere with his observation.

Soon, a little brown oil droplets began to appear in the tung oil, and slowly the brown oil droplets slowly increased, dyeing the surrounding golden tung oil, and more and more tung oil turned brown.

"Look, the color has changed now, it's brown or coffee, you have to remember. Now draw out a piece of firewood. ”

Ding Qi saw that the color of tung oil began to change, and immediately pointed it out to Jing and Tanuki, so that they could understand what coffee color was, and at the same time reached out and pulled out a piece of firewood to prevent the oil temperature from continuing to rise.

Ding Qi still used the wooden spoon in his hand to stir clockwise, and slowly the water vapor and bubbles that came out became less and less until there were no more. At this time, most of the golden tung oil has turned brown, and it only takes a little more to cook the pure tung oil to be successful.

Ding Qi handed the wooden spoon to Jing and let him learn to stir it.

"Remember, be sure to stir clockwise."

Seeing that the cooked pure tung oil had been boiled successfully, Ding Qi pulled out most of the firewood, leaving only two firewood that was about to burn out in it, in order to maintain the temperature of the tung oil and not cool it down too quickly.

Then Ding Qi motioned for the raccoon dog to go and get another clay pot.

"Tanuki, you have seen the whole boiling process just now, and now you boil a pot by yourself, I will watch with Jing on the side, and at the same time prepare to brush the paper curtain with tung oil. Let's go! ”

Ding Qi stopped caring about the raccoon dog and focused his attention on what he was going to do next, brushing tung oil.

He first took out a small brush, which he made out of wolf's hair. It is made by stuffing a small pinch of wolf hair into a bamboo tube and trimming it several times with bronze scissors.

"Brushing tung oil can't be made once, at least three times, in order to let the tung oil soak into the wood to achieve the purpose of waterproof and anti-corrosion. Every time you brush it, the oil layer should not be too thick, but a thin layer, so you can't dip too much tung oil each time, and when you brush it on the wood, you should quickly slide it over and lightly apply a layer, like this. Remember, it's just a thin brush! ”

Ding Qi said the precautions for brushing tung oil, which was not only like explaining to Jing Zai, but also like he was recalling and reciting the skills he learned at that time. Then he dipped a little tung oil in the pottery pot with the wolf hair brush in his hand, quickly moved it to the paper curtain, and slid it over lightly and quickly.

Without looking at the effect of brushing, Ding Qi scratched the wolf hair brush in his hand to another place where there was no oil, and continued to brush. After there is no tung oil on the wolf hair brush, take the wolf hair brush back to the place where the tung oil was brushed just now, and dip the tung oil on the curtain on the wolf hair brush to make the tung oil on the curtain thinner.

The whole process is slow to say, but quick to brush. After a while, Ding Qi's freshly soaked tung oil had all been brushed onto the papermaking curtain, and there was only a thin layer of ground.

He then handed the wolf brush to Jing and let him learn how to brush tung oil.

"Come on, you try."

Jing is a carpenter, his hands and feet are very sharp, pick up the wolf hair brush and learn to brush it on the paper curtain like Ding Qi, and from time to time he will brush the tung oil that is brushed to other places, and his careful appearance is no worse than Ding Qi.

Ding Qi was embarrassed for a while, he deserves to be a carpenter! With a talent bonus, you can do anything fast.

Ding Qi sometimes can't help but think that God has brought himself to a primitive society, and it seems that he really has no other useful skills except for language to make it easier for him to communicate with primitive people. The life skills he uses at present are basically from the accumulation of his previous life, and there is no factor in it at all.

Goldfinger! Isn't there any? Look at other people's talents, and then look at yourself, who is the traverser?

Ding Qi became more and more depressed, and simply stopped thinking about it, and took out one thing in his arms. The pale yellow transparent solid, rubbing down in the hand, a faint fragrance came into the nose, and the good smell of pine said.

This is a piece of rosin, the kind of high-viscosity secretion that Tincke collects from pine trees in the forest, and is extracted by heating.

As mentioned earlier, the cooked tung oil is cooked "pure" tung oil, without any additives. And he is now going to add a piece of rosin to the tanuki boiled tung oil to make a mixed cooked tung oil. This tung oil has a characteristic, that is, the cooked tung oil dries quickly, and at the same time delays the gelatinization time of tung oil.

In fact, this gelatinization process is very crucial, especially in the process of brushing tung oil in a large area. If tung oil gelatinizes too quickly, it will lead to insufficient oil absorption of wood and cannot achieve the purpose of better waterproofing and anti-corrosion.

Ding Qi oiled the paper curtain, and did not need to soak the tung oil too much into it, but only needed to form an oil film on the outside of the curtain, so that the wet paper could be quickly removed.

When you want to brush large objects such as wooden furniture or wooden boats, you need to consider the gelling time of tung oil, so adding rosin is the easiest and cheapest method.

Ding Qi hesitated there, fearing that the mixed tung oil he made would not be used on the ship and would be wasted. Now I don't have too many brushes on hand, and I'm worried that Vitex won't be able to use so much mixed tung oil and waste it.

Ding Qi told Jing about his worries, but he didn't expect that he didn't care, but he was still excited, and said that Ding Qi didn't have to worry. He is now worried that he can't find the right materials to waterproof and anti-corrosion for that ship, and now that he finally has it, it's too late to be happy, how can he be afraid of wasting, he can't wait to use it all!

Moreover, he prepared two brushes for himself, which he used when making some wooden utensils, which could be used to brush tung oil.

"Okay, in that case, then let's start boiling and mixing cooked tung oil!"

Seeing that the heat was about the same, Ding Qi took out a few more pieces of rosin and smashed them into the pot that the raccoon was boiling, telling him to speed up and stir. Then he took the wolf hair brush in Jing's hand and brushed the paper curtain with tung oil, and asked Jing to start preparing to brush the wooden boat with tung oil.

It's just that before brushing the right, Ding Qi told him that he must ensure that the wood is dry and clean up the cracks in the wooden board, because he will have to teach Jing how to prepare a leak plugging agent, which is a key thing. Only by plugging the gaps in the hull can you continue to brush tung oil, which is also very important, and the process or process can not be messed up.

The kind of leak plugging agent in Ding Qi's heart was actually told by the carpenter, although he was greedy for fun, some things were remembered in his mind. His brain is like a memory, and after typing in some keywords, he will immediately open that part of the memory and become the information he needs.

I really don't know how to describe this part of the memory, is this the golden finger that God let himself pass through? It's not like ah, this is something I've experienced, but it's just dusty. Take the knowledge in your own memory, can this be called a golden finger? No matter how you think about it, you can't!