Shader Forge outputting gray instead of black

I’ve been following this tutorial from the developer of Shader Forge.

I’m sure I’m not missing something, having completed the steps 10 times over.
Can someone please tell me what is going on?


My result


His result

I am a beginner . and my English is very poor .
BTW . Let me try to answer . and hope that will help you .
I think your texture is tilling when U chanel is 0 . the texture show white color.
Try to set the texture for clamp . It maybe work .