One advantage of aesthetic multi-gradient zirconia like Katana STML, ZirCAD Multi, and ZirCAD Prime is the ability to polish and blend right out of the sintering furance.  This video will provide the steps for post sintered aesthetic zirconia polishing using the JK04 using the Meisinger Zirconia Polishing Lab Kit.

Meisinger Zirconia Lab Kit JK04