Hex #b31a2b or rgb(179,26,43) in RGB space is the tint of red. It has hue angle of 353.33 degrees, value = 70 and saturation = 85. #b31a2b can be obtained by mixing 4 colors: 5 drops of red, 1 drop of magenta, 1 drop of white, 3 drops of black.
Nearest safe hex - #cc3333. Below you can see the block with #b31a2b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #b31a2b to the mixer and play with it.