Hex #a21a5d or rgb(162,26,93) in RGB space is the tint of scarlet. It has hue angle of 330.44 degrees, value = 64 and saturation = 84. #a21a5d can be obtained by mixing 3 colors: 5 drops of red, 2 drops of magenta, 4 drops of blue.
Nearest safe hex - #993366. Below you can see the block with #a21a5d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #a21a5d to the mixer and play with it.