I'm having issues with "$envmapmask"

So recently i tried to make a model for gmod which has reflections and uses a mask to make the model less reflective, however, everytime i try to view how it looks ingame it always turns out to look like this

and here is the VMT of the texture that the model uses


VertexLitGeneric
{
	$basetexture "CCS/Wands/BirdWand_Diffuse"
	$surfaceprop Plastic

	$envmap "env_cubemap"
	$envmapmask "CCS/Wands/BirdWand_Specular"
}

any help would be appreciated

try using $envmaptint

f.e.


$envmaptint "[0.1 0.1 0.1]"