Hex #663f4f or rgb(102,63,79) in RGB space is the tint of scarlet. It has hue angle of 335.38 degrees, value = 40 and saturation = 38. #663f4f can be obtained by mixing 4 colors: 5 drops of red, 1 drop of magenta, 4 drops of cyan, 5 drops of black.
Nearest safe hex - #663366. Below you can see the block with #663f4f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #663f4f to the mixer and play with it.