What is the word "Ma Dou" in Degang Guo's cross talk "Vinegar Lamp"? Please explain in detail what Shenma is used to make a stove.

Má dā o [hemp chopped up to make stretching mortar] is a fiber material, not a knife! Simply put, it is a kind of fine hemp, broken hemp. Usage: mixed with lime to strengthen the connection of materials, prevent cracking and improve strength. In ancient times, clay houses were mixed with mud to improve the toughness and connectivity of the walls. It is an indispensable auxiliary material for making roof tiles in ancient buildings. Technical term refers to: hemp knife ash, which refers to a mortar combining white ash, hemp knife and blue ash. Beijing Great Wall Ancient Buildings (Used for Building Roof Tiles) —— Inheriting China Ancient Architecture Culture III. How to make it? The editor used a hemp knife machine or bamboo sticks to beat it into flocculent hemp balls.