Just need to put the hair color in the cup, shake the cup to mix the hair dye cream evenly, then you can start your work | This mixing bowl is excellent for mixing developer with hair dye, hair toner, and hair | Sturdy and durable plastic for use. They wont easily stain or damage | Easy to use when working with one hand, allows for easy mixing and application of hair dye | Non- slip bottom keeps the bowl from sliding on the counter, does not tip- over