White is absolute specularity/reflectivity while black is no reflection whatsoever.High contrast, variations between black and white are easily visible.Some notes to keep in mind which often determine a good specular texture are: In most cases this is a modified black and white diffuse merged with perhaps different rendered maps such as cavity maps to achieve a desired look. This is the texture representing the specular intensity and color of material highlights defined as the "shininess" and color of specular reflections. See Creating Textures for Physically Based Shading for more information.
This information is based off a non-PBR workflow and is largely obsolete since CRYENGINE 3.6.
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