Aogami, also known as Blue paper steel due to the colour of the paper it came wrapped in, is a high carbon steel made by Hitachi Metals. Aogami is known for its sharpness and edge retention, blue paper steels are considered some of the best carbon steels in the world. It’s like Shirogami but with added tungsten and chromium to give it better edge retention, it comes in 3 grades Aogami #1, #2 & Aogami Super.