There is a new 'sticky' topic on the forum in the Semi Permanent Hair Dyes section - this shows the base colours or colours dyes fade to for all semi-permanent hair dyes. This is based on an original post created by Pinky asking for the base colours for special effects dyes but I have now expanded this and created a sticky to cover all semi-permanent hair dye brands.
A good list of hair dye base colours would be very helpful so please post on there the results of faded/base shades of any dyes you have previously used.
Base Colours of Semi Permanent Hair Dyes
(Thanks again for the idea Pinky)