Raw steak: the inside of the steak is blood red, and the internal temperature is kept at a certain level (higher than that of very rare steak).

Medium rare: It's pink inside and quite hot.

Medium rare: the steak is pink with light gray and brown inside, and the whole steak is very hot.

Medium-rare: the steak is mainly light gray-brown with pink inside.

Well-done: The inside of the steak is brown.