Hex #5b403d or rgb(91,64,61) in RGB space is the tint of red. It has hue angle of 6.00 degrees, value = 36 and saturation = 33. #5b403d can be obtained by mixing 4 colors: 5 drops of red, 5 drops of blue, 3 drops of green, 1 drop of black.
Nearest safe hex - #663333. Below you can see the block with #5b403d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b403d to the mixer and play with it.