I am using Vallejo Model Air 71.081 Tank Ochre as the primary color on my Solar Auxilia vehicles. I would like to use a second Vallejo Model Air color a shade darker than the 71.081 Tank Ochre for shadows and blending. Their numbering system seems completely scattered/random and using my computer screen I cannot tell from their charts what the next darker shade would be....

I could always add a drop or two of black to the airbrush cup along with the 71.081 Tank Ochre, but consistancy would be more difficult.

Any help would be appreciated!!

Cheers!