Bai Wanyi was furious and immediately went to ask the Fourth Prince for saltpeter. She wanted to make lots of ice. In the summer, ice was expensive, so she put a lot of ice in cold drinks. She also added sugar to make them sweet! She even added honey to make them so sweet that they would die! So that everyone could drink to their heart's content!

At the same time, she also asked people to sell ice cream to the public. Qin Wan's ice cream must be very expensive! She wanted Qin Wan's ice cream to be unsellable!

It’s a pity that adding sugar is useless. Even if they added sugar and honey, they refused to add milk or fruit, and put more ice. The taste of the milk tea became bland, and the business became worse and worse.

As for ice, no matter how much she sold, the market price remained quite stable. In fact, because she sold a large amount of ice, the price of ice in Beijing even dropped.

Later, the price of ice dropped to 800 wen per cart. Ordinary people could grit their teeth and buy some ice to take home to cool off, but the merchants who asked Bai Wanyi to buy ice went out to buy it. She made too much ice and some of it was hard to sell.

In the end, because of the huge consumption of saltpeter, no money made, and the inability to sway Qin Wan in the slightest, Bai Wan fell ill due to anger and had to stop selling ice.

Qin Wan heaved a sigh of relief when she heard about this. "It's been hot this year, and I've been worried that the price of ice would go up. The people would suffer, so I've been suppressing the price. The Bai family's move is a disguised good deed."

Tao Yao didn't understand: "Miss, we already have a method of making ice with saltpeter, why don't we use it?"

Qin Wan tapped her head and said with a smile, "How expensive is saltpeter? Add in the manpower and silver for all kinds of equipment, how much will it cost? Wouldn't free ice in winter be nice?"

Tao Yao suddenly realized: "That's right, in winter, we can just go to the river to get ice. There is plenty of ice in the cellar. Although it is hot today, we can also freeze ice ourselves."

"Miss, there's a letter from the Crown Prince." Zhenzhen came in through the curtain holding a box.