no sorry
You cannot turn a permanent hair colour into a semi permanent hair colour. Permanent colours are made of small colour molecules that need a developer to create the chemical reaction required for the colour molecules to penetrate the hair shaft and tint to the desired shade. True Semi permanents are pretty much topical with mainly large colour molecules. (which is why you see the shade while the product is still in its original packaging) They require no developer as they sit ON TOP of the hair shaft with fewer smaller colour molecules that penetrate the cuticle.
Permanent hair colour contains hydrogen peroxide whereas semi doesn't. Permanent colour changes the colour inside the hair. Semi doesn't. Permanent colour is permanent whereas semi only last 6-8 washes.
black
yes but if you want to go red for instance you need to build it up
Permanent colour doesn't wear off. Your natural colour grows out. If you were grey before you dyed your hair then the roots will grow out grey. Colour doesn't make your hair turn grey.
yes
A semi permanent colour is a colour that lasts 6-8 weeks. It lies just under the cuticle of the hair and this is why it washes out. (It doesn't enter into the hair or affect the internal structure of the hair).
If it isn't permanent colour, yes.
Every week
Yes but only with a permanent hair colour. Any other will not stay in the hair.
No, the colour of an individual hair depend on the inherited gene hair colour of which they have obtained from their parents however if you were to dye your hair permanent it does remain the desired colour but new growths will be your natural hair colour as the chemicals used in dyeing your hair do not penetrate into the roots. Continuous application is required to maintain that hair colour.
It might make your hair dry and will cause split ends