In catalyst, people always add boehmite as binder, but it is not good result with water. You could add acid to improve the viscosity of boehmite as binder
Weight ratio
Pseudo-boehmite: dilute nitric acid (1 part 64% nitric acid: 5 parts water, volume ratio): Tianjing powder = 100:40:3-4
Screening Tian Jing powder + pseudo-boehmite (at least 80 mesh, of course, the finer the better, but it is very difficult to sieve, hehe)
Add nitric acid, add it slowly, add it while using a small stick (see how big you are, this concentration of nitric acid is not a problem with your hands). Stir well, knead
Squeeze the strip first, then mix the strips together, cover them with a wet towel, and “wake up” for a while like a noodle. After about 30 minutes, first use your dough to live like a face for a while (because Boehmite and thixotropy after acid dissolution, this process is very important), until the live dough is soft and not very sticky, It is all ready.