[ATM] Black black (and butterflies)

[vladimir.galogaza at zg.tel.hr (Vladimir Galogaza)]

David,

Thanks for interesting article.

The:
>new coating for the inside of optics that uses interference as
>well as absorbtion to blacken optic parts to 99.7%.

you mentioned, as far as I know, is not based on interference but on
texture.
Nickel phosphorus is very black but its microtexture enhances blackness
to mentioned 99.7%. This is electroplating process.

Regards
Vladimir.

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