It is much harder than talc. Think about it. From: "Rothman, Aric" <[EMAIL PROTECTED]>
> Interestingly, carbon (graphite) is both the softest (tying with talc), and hardest (diamond) mineral, per Moh's > hardness scale. Depends on its molecular structure. > > I have no idea how the typical lens coating material compares in hardness, quantitatively speaking. > > > From: graywolf [mailto:[EMAIL PROTECTED] > > > > Well, carbon is the hardest stuff known, so of course it has > > an abrasive effect. > > But the stuff used for this is super, super fine so it > > polishes rather than > > scratches. I would not recomment daily use though.
