Tamiya Weathering Master B (Snow, Soot, Rust)

Snow (for winter camouflage and light snow)

Soot (for soot from exhaust pipes and gun barrels)

Rust (for rusting of AFV and boat hulls)

Easy Way to a Pro-Level Finish
Weathering
means adding realistic-looking effects to your models, such as sand on
tank treads and mud-caked rally car bodies. These new Tamiya Craft Tools
offer by far the easiest way to achieve realistic weathering effects.
Weathering Master comes in a pocket sized case with 3 colors and special
applicator tool. The pen-type Weathering Stick offers up to 5mm of
easy-to-apply color by simply twisting the tip.