Zhang San stayed in the shipyard for five days and dealt with some things, such as the collection of oil, the south is different from the north, the south does not have the habit of planting soybeans on a large scale, and the oilseeds are mainly tea oil and tung oil in addition to rapeseed oil.

Rapeseed oil is not as widely cultivated as in later generations, stir-frying has not yet risen, the oil extraction process is not up to par, the oil yield of rapeseed oil is not high, and the yield per mu is not high, so it is impossible to buy a large number of them.

Camellia oil is edible oil, because it does not occupy arable land, so in addition to a small amount of planting, there are a large number of wild in the south, as long as a certain price is given, there are still a large number of people willing to go up the mountain to pick, is a good source of oil.

Tung oil is a widely used oil crop, and camellia oil does not occupy arable land, ancient building antiseptic in addition to the use of paint, some will also use tung oil anticorrosion, even if it is paint, paint also use tung oil, as well as the anti-corrosion of fishing boats and sea vessels, the soaking of sails and fishing nets, etc.

Therefore, tung oil as a special cash crop has a large number of plantations to plant, this is also very easy to buy, but the price of ancient oil crops is generally relatively high, Zhang San needs to make soap is a large amount of cheap oil, with the price of these three kinds of oil Zhang San can not make cheap soap.

So this problem has become a big problem for Zhang San, Zhang San originally planned to wait for the sunflower to grow for two or three years to form a scale, then there will be no shortage of oil, but he didn't expect the development to be too fast, and the funds are a little unable to keep up.

In desperation, Zhang San had to plan to buy a small amount of soap and make it first, and take the route of high-end products. The profit of making soap alone is actually not bad, as long as the operation is good, it is also a large amount of income.

Then it is to buy quartz stone, lime and soda ash, with these three things, Zhang San is groping for the right proportion to produce glass, and the acquisition of this formula is still Zhang San asked the monkey to find an old craftsman who burns glass to learn.

For the purpose of maintaining secrecy, the old craftsman only told a few basic raw materials, but the process of proportioning did not be revealed. In the eyes of the old craftsman, such raw materials can't make that kind of colorful glass, but he didn't expect that Zhang San didn't want to burn the glass at all, but just wanted to recall the glass production process according to his raw materials.

Originally, Zhang San thought that after he made glass, he could make a big killer of mirrors, so that he could earn a lot of wealth, but the reality did give him a heavy blow.

First of all, the glass is not something that the Great Song Dynasty can't make, think about the glass that is more complex than glass can be made, it is impossible that no one knows how to make glass, and sure enough, after letting the monkey inquire about it, this is indeed not a secret.

Then there is the mirror, Zhang San used to be poor when there was no copper mirror at home, and after he was rich, he also felt that a copper mirror in the big man's room was too smelly and beautiful, so Zhang San rarely used a copper mirror, so he didn't pay attention to the copper mirror.

But Zhang San deliberately went to learn about the ancient copper mirror making process in order to be afraid of glass-like jokes, but he didn't expect to make a profit, and sure enough, he still found that his idea was too naïve.

The ancient cheap copper mirror is indeed of average quality, just a smoothed bronze round mirror, the price is equal to the same weight of copper coins, that is, the thicker the mirror, the more expensive, this kind of mirror can generally reflect the complete appearance of people, and does not affect the normal use.

This is also the general copper mirror is easy to rust, and it needs to be re-sharpened after rusting, so the thicker the mirror, the longer it will be used. Generally, the price of an eight-pound copper mirror is always around a few hundred yuan.

In addition to this general copper mirror, there is also a high-end version, a copper mirror treated with mirror grinding medicine, this kind of mirror is almost not much different from the effect of the current glass mirror, and even a large mirror of one or two meters can be customized, and the price of this mirror is only about five times.

This discovery made Zhang San feel that he must be a fake traverser, this special ancient world has everything, Lao Tzu is still playing a fart, how many traversers can rely on making glass and glass mirrors to make huge profits and go to the peak of life. A sale is hundreds of taels, thousands of taels on one side, to their own really to compete with the five copper mirrors for the market.

Such a result once made Zhang San ashamed to think that he was a traverser, how could he face the vast number of traverser compatriots in the future? I was ashamed to tell them that the bronze mirror made by my Zhang San was sold for a consistent price at most. Even if you can't sell it!

People's ordinary copper mirrors are copper-containing good, the sound of falling to the ground is still used, our glass mirror fell to the ground and was broken, the cost performance is not comparable at all, the ancients are not stupid, such an account they calculate is the door clear.

As for glass, why everyone knows the production process of glass in ancient times, but no one makes glass items, it is not that there is no market, ancient China is respected by porcelain, and it is not a luxury product in Europe, and the general aristocracy can only use silver tableware, and ordinary people use pottery.

As for selling to Europe? Are you stupid? I went all the way to the Celestial Empire, and I didn't go to buy a large number of ceramics and went to Europe, which didn't even have a market in the Great Song Dynasty?

After some analysis, Zhang San finally determined a fact, it is impossible to make glass into a luxury product, as a civilian consumer goods, relying on high quality and low price and accurate market positioning.

Fortunately, glass has the advantage that ceramics do not have, that is, light transmittance, glass can be used as a window, this glass has the advantages that other materials do not have, glass can also be used as canned bottles, this canned fruit is not more cost-effective if packaged in glass bottles, and it is easier for buyers to intuitively see the contents inside.

And like what sugar jars, spice jars, medicinal wine bottles, perfume bottles, etc., these can be made of glass, and there are mirrors, although the glass mirror has no profiteering, but his material cost is cheaper, as long as the price is right, it is easy to occupy a part of the market.

Then there is the sugar business planned by Zhang San, fortunately, there is such a thing as frosting sugar in the Northern Song Dynasty, but there is no large number of preparation methods, and it can only be supplied to the court in small quantities as tribute, as well as the aristocratic market.

Therefore, Zhang San's next three big businesses instantly became two broken big businesses of soap and glass, as well as the violent business of sugar, which made Zhang San a little unhappy.

In an instant, Zhang San hit the idea of the Zhangjia Silver Treasury on Taihu Lake, as well as Zhang Dan's treasury, Zhang San's treasury Zhang San had already sent Shi Qian to investigate, I believe that with the level of time migration, it will not take long for the news to come. At that time, it is most appropriate to rely on these two votes to complete the next stage of capital accumulation.