This is a colection of node groups to get color harmonies.
Including:
Complement,Split-complement,Triad,Tetrad,Analogous,Mono-chromatic.
In your monochromatic node, the last color there the Hue should be on 0.5 and the saturation on 0.250 It seems that these value are interchanged with eachother.
I'll check it out thank you. Also sorry for the super late anwser I didn't get any email for this... i'll check my account settings.
Interesting