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the *need* for a post 30k hone is almost zero.
The amount of effort to produce pure nano-grit abrasive particles
increases making the hone somewhat cost ineficient.
That´s why a synthetic post 30k...

there are several high-tech polishing compounds.
The question is, do you really want to go there?

Those compounds have been invented to polish parabol mirrors
for astronomic telescopes.
An...

Ah, I know what he is referring to:

this grit comparson sheet:
http://straightrazorpalace.com/advanced-honing-topics/39720-abrasive-grit-comparison-sheet.html

lists indeed shapton 60, 120,...

A 200.000 (200,000?) grit Shapton?
I never saw one.
The highest grit of shapton (of all synth. hones I know)
is 30.000 in the Mesh System (wich is 0.5µm) from Shapton,
availiable in Glass and...