Do Japanese ninjas really have invisibility?

Invisibility is actually a technology in ancient Japanese forbearance, that is, using the environment to hide oneself. Because ninjas mostly perform tasks at night, their clothes are mostly purple or black. Generally speaking, there was a ninja who was famous for digging tunnels, but I forgot that he spent three days digging a tunnel and planned to assassinate a politician. However, because of the sweat on his body after continuous digging, the fly was attracted, and the guard noticed that he had stabbed the ground, right in the middle of that life.