Hex #991a1a or rgb(153,26,26) in RGB space is the tint of red. It has hue angle of 0.00 degrees, value = 60 and saturation = 83. #991a1a can be obtained by mixing 3 colors: 5 drops of red, 1 drop of white, 4 drops of black.
Nearest safe hex - #993333. Below you can see the block with #991a1a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #991a1a to the mixer and play with it.