Just tried side-by-side application of Black 3.0 vs Black 2.0.
Black 3.0 is indeed blacker at all angles of incidence, and it is a velvety black - not "dark grey" the way Bunnings cheap flat black does. The 3.0 is also blacker than the gloss black powdercoat stuff on my refractor.
Withstands a light touch from fingers with no ill effect so I'd say its worth using to blacken scope parts.
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