Ecocolors Professional Haircolor will lighten 4 levels with Extra Fast Developer. If you need to lighten more than 4 levels you should use a non dusting hairlightener of your choice. Be sure to wear a mask when opening your hair lightener and mixing it with a developer. Regular developer is the recommended developer to use with all powder hair lighteners. Please read the Ecocolors Basic Haircolor Theory manual on the Professional page for our philosophy on hair lightening. Ecocolors does not sell a bleaching agent.