Never get stuck on finding "perfect shade"s of paint straight from the bottle. Especially German Dark Yellow. Mix white into it and experiment with different colors--gray, tan, Buff, etc--and just "eyeball" it. As has been correctly stated, weathering wil change eveyrthing significantly, so learn to work the color with your weathering technique. My DY tanks always start out as nearly a whitish shade of yellow, which then gets brought into "corect" tone with weathering and shadings filters. I don't think any two of my German tanks has the same shade of DY on them.