Hex #66212b or rgb(102,33,43) in RGB space is the tint of scarlet red. It has hue angle of 351.30 degrees, value = 40 and saturation = 68. #66212b can be obtained by mixing 4 colors: 3 drops of red, 1 drop of blue, 1 drop of white, 5 drops of black.
Nearest safe hex - #663333. Below you can see the block with #66212b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66212b to the mixer and play with it.