Hex #663133 or rgb(102,49,51) in RGB space is the tint of red. It has hue angle of 357.74 degrees, value = 40 and saturation = 52. #663133 can be obtained by mixing 4 colors: 3 drops of red, 1 drop of cyan, 1 drop of white, 5 drops of black.
Nearest safe hex - #663333. Below you can see the block with #663133 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #663133 to the mixer and play with it.