Why is the tea foam in Song Dynasty so white and rich?

Milky white is a kind of foam cake, and the appearance of tea powder has a great relationship with the quality of tea cake making, the use of utensils and the method of brewing.

When water rushes into the tea bowl, it needs to be hit hard with a tea basket, and bubbles will slowly appear. The quality of tea is judged by whether the foam cake appears quickly and whether the waterline appears slowly. The foam is white, and the water feet are exposed late and do not come loose. Because of the fusion of tea and milk, the water quality is sticky, so drinking it is called "biting the cup". Tea people use this to compare the outcome, and the winner will triumph like a soldier, and the loser will fall.

Making tea soup for the first time is the most important thing:

Usually, after washing tea, the soaking time of the first tea soup is generally more than 25 seconds. But the determination of this time should be based on the premise that the tea leaves have basically stretched. If the tea is not stretched, you can still look at the color of the tea soup at this time. If the color is dark, it won't change much. Then the tea soup should come out.

The longer the first tea soup is soaked, the less resistant the tea leaves are to soaking. Tea that could have been soaked seven or eight times, because it was soaked too hard at first and weak behind, so that the tea soup became weaker and weaker.

The soaking time of the first tea soup is too short. Although tea is resistant to soaking, the taste of tea soup is difficult to reach a new level. No matter how long the soaking time is increased, the tea soup always smells like water, as if it were not "excited".