Currently building a Viet Nam era Patton tank and am using XF74 as a base coat and would like to shoot a lighter shade of same color to achieve a faded look. I read somewhere if you try to lighten with white it makes a nasty pea soup color, this person suggested mixing with a mustard yellow. Thought I would run this one by the local Gurus before I try anything, what do you guys think?
thanks, Sean

I would suggest Dark Yellow, so that would be a good option. I normally use Vallejo OD, and use Dunkel Gelb to lighten it.

Try Tamiya Buff.

Yep Tamiya Buff is the way to go for OD.

I've also seen the use of yellow for OD.

Most colors fall into either warm or cold tones. Yellow brown = warm, Blue = cold. Keeping with a warm color to lighten will ensure the tone is not too far off.

I prefer to lighten greens with lighter shades of gray.

You can use yellow, dark yellow, buff, white or matt flesh, depending on the tone you want.

Tamiya Deck Tan or Buff

Everyone has their favorite color for lightening other colors. The main thing is to not use white. Intuitively, white would seem appropriate, but it just won't look right.

Buff, German Dark Yellow, Desert Yellow, as already noted. Each color will have a different effect on the OD for different fading, weathering, color batches, etc. You could even mix your own OD with German Dark Yellow and Black, and vary your proportions slightly for variations.