![](https://www.passion132.com/963-large_default/VALLEJO--76-522-Model-Wash-Desert-Dust---Lavis-Poussi--re-du-d--sert.jpg)
All surfaces exposed to sun, wind and dust, rain and snow, experience a change in color, a loss of intensity, a dulling and general fading which however is not even or overall. For the model painter, these changes in color are very difficult to reproduce, and to achieve these effects on a model, washes or filters are the perfect solution.