Hex #66904d or rgb(102,144,77) in RGB space is the tint of grass green. It has hue angle of 97.61 degrees, value = 56 and saturation = 47. #66904d can be obtained by mixing 4 colors: 3 drops of yellow, 2 drops of cyan, 1 drop of white, 4 drops of black.
Nearest safe hex - #669966. Below you can see the block with #66904d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66904d to the mixer and play with it.