1B is not jet black, but it is a very dark shade. The richest and darkest hue available, 1B is ideal for those looking for a dramatic look. If you want jet black hair, then you will need to use a dye that is specifically designed for black hair. 1 is jet black, but it is also a very intense color that may not be suitable for everyone. Jet black hair is a very dark shade of black that is almost blue in color. It is the darkest color possible and is oftentimes referred to as "blue black."