If you all want, this can become a central repository to post problems with the help file...
Here's what I've found
VRayBlendMtl
I believe you meant black
Here's what I've found
VRayBlendMtl
Blend amount - this color specifies how much of the final result is contributed by the corresponding coating material, and the rest of the materials below it. If the Blend amount is white, the final result is comprised of the coat material only, and other materials below it are blocked. If the Blend amount is white, a coat material has no effect on the final result. This parameter can also be controlled by a texture map.
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