Hex #991811 or rgb(153,24,17) in RGB space is the tint of red. It has hue angle of 3.09 degrees, value = 60 and saturation = 89. #991811 can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of red, 1 drop of magenta, 4 drops of black.
Nearest safe hex - #990000. Below you can see the block with #991811 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #991811 to the mixer and play with it.