Ключевые слова: alert, army, attention, background, biological, brown, chemical, chemistry, corrosion, damaged, danger, dangerous, dirty, distressed, grime, grunge, hard, hazard, icon, label, material, messy, obsolete, old, panel, plate, risk, rough, rust, safety, sign, stain, stamp, steel, surface, symbol, texture, wall, war, weapon, yellow,