Sep 27, 2019 · Step 4: Pulverizing / Grinding. Pulverizing or Grinding machines are used to grind the raw, whole spices into the powdered form. Step 5: Grading. The grading is done based on the inclusions and proportion of spices mix with their raw materials. Also, it is graded on the basis of the size, flavor of spice, shape, density, and color of the spice.