For Toppers and Wigs with treated hair applies: Darker color is possible, lighten not.
Since the hair has already been bleached should not be further lightened. Otherwise, the hair can be permanently damaged, or unexpected color effects can occur.
For darkening, we recommend semi- or demi-permanent color (tints). The cuticle is open in already treated hair and thus absorbs color much faster than untreated hair.
Untreated (virgin) hair qualities can be colored and bleached as desired. However, lightning is always associated with a loss of quality and should therefore be well-considered.
Any color change should always be tested on an inconspicuous area before treatment.