For a design choice, specific paints for afv's into the SDW Shading Colors range - p.ex. ral 7028 dunkelgelb, olive drab, russian green - have a more intense / darker shade, instead of being arbitrarily reduced-to-scale.
Here why :
- first of all the model may require, or you might like, a more intense color shade
- second, it is easier to enhance the three-dimensionality with lights and shades (a technique that others call modulation ...) having intense tones available from the start
- third, in case of common error, for example excessive lightening of the high areas, it is easier to recover with a glaze of the base color + Glossy Additive
In case of "normal" painting (without preshading / postshading), you can add to colors and mixtures TESC02 White or TESC16 naples yellow (the latter also contained in Paint Variation & Weathering Set TESE23).