why does this material go black when i hit smooth?

Support Materials and Textures
1

stc=1stc=1
thanks all

Attachments

odd material.blend (676 KB)

2

Your object has a negative scale
Select the object and apply the scale (Ctrl+A)

3

never heard of negative scale. thanks

4

Similar effect as having inverted normals

5

inverted normals? blender is strange!
thanks