Smog Tube Coloring

[69 L88]

The original BB smog tubes are brownish in color,
SB tubes are black

[Keith Tedford]

I have a new manifold that I bought from GM many years ago. It is the dark olive green that was mentioned here previously but could be mistaken for black under some lighting conditions. It seems to be see through and in the sunlight there are little prisms of colour here and there. The whole piece appears to have been coated or plated after it was assembled. This is not necessarily the way the factory did the assembly line stuff, it is just what I have.