Shapton Kuromaku Correction Powder for Lapping Plate
Use the coarse powder for coarse stones with grit grades from 120 to 320
Use the medium powder for medium sharpening stones with grit grades from 1000 to 2000. For heavily worn stones you can use the coarse powder.
Use the fine powder for fine sharpening stones with grit grades from 5000 to 12000. For heavily worn stones you can use the medium powder. Use only the fine powder for the extremely fine polishing and honing stones with 30000 grit grade.