Material Editor > Standard material > Maps rollout > Specular button
You can select a bitmap file or procedural map to apply an image to the material's specular color component. The map's image appears only in the specular highlight areas.
When the amount spinner is at 100, all specular color is provided by the map.
Specular mapping is used primarily for special effects such as placing an image in a reflection. The important thing to remember is that, unlike Specular Level or Glossiness mapping, which alter the intensity and location of specular highlights, specular mapping alters the color of specular highlights.
To map the specular color:
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Click the Map button for Specular color.
The Material/Map Browser is displayed.
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Choose from the list of map types, and then click OK.
The Material Editor is now at the map level, and displays controls for the map parameters.