Do you guys think this Chromium oxide would be the correct kind? There's no mention of micron or fineness.
Green Chrome Oxide Compound - Woodcraft.com

Also, Which DMT stone is the one everyone mentions for lapping stones? Like for lapping a norton 4/8k and finishing hones. I 've seen names like DMT 325 grit and DMT 8C but I don't see anything like that on this site:
Search for Woodworking Supplies at Woodcraft

Reason I ask is that there's a woodcraft retail store near me and it would be much easier to pick these up there!