Adding optional ingredients.
CFR · 2024-01-01 · US · Title 7
As each batch is added to the cooker, the predetermined amounts of salt, emulsifiers, color, or other allowable optional ingredients shall be added. However, a special blending vat may be used to mix the ground cheese and other ingredients before they enter the cooker to provide composition control.
official document · source cfr-2024 · id 7:§ 58.727