Hex #1a556f or rgb(26,85,111) in RGB space is the tint of bluish cian. It has hue angle of 198.35 degrees, value = 44 and saturation = 77. #1a556f can be obtained by mixing 4 colors: 1 drop of red, 2 drops of blue, 3 drops of cyan, 4 drops of black.
Nearest safe hex - #336666. Below you can see the block with #1a556f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #1a556f to the mixer and play with it.