Why is there a red tassel on the spear in Chinese martial arts? Why are there two grooves on the head of the gun?

The role of the red tassel is said to be, the tassel spike blood, can organize the blood on the head of the gun flowing down the gun barrel is not conducive to the bearer of the gun force, in other words, is to wipe the blood rag, choose the red color is because the color of the blood dyed and in the attack can be given to the opponents to create the illusion of increasing morale, as for the two grooves is the blood groove, with the military spikes and so on on the knife on the blood grooves have the same function, are in order to better penetrate into the human body and to prevent the absorption in the body, can be better pulled out. The body, can be better pulled out