"Frogwatch" wrote in message
...

TiN is used as a diffusion barrier on Silicon wafers. It is deposited
to a thickness of roughly 50 angstroms forming a truly beautiful dark
purplish color that changes depending on the angle you look at it to
green and then other colors. I have some 300 mm wafers with Tin that
always catch peoples attention for their beauty.

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One of the major pen companies does a similar TiN coating on one of their
pen lines.
I helped the thin film guy tweak the color while the system was being built.

Eisboch