Progressive dyes deposit more color every time you use them. The color builds and builds. Be aware, however, that some progressive dyes may contain lead and other toxic metals and can become dangerous if you intend to perm or relax your colored hair.
You may run the risk of your hair melting away if the perm reacts with the metals in your colored hair. To be safe, use a special perm formulated for color-treated hair. Best advice: Go to a salon and have it done professionally.