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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).
in the cortex
Quasi permanent hair color is gentle on the hair structure, but gets lighter with each hair wash. This type of color keeps the hair structure soft.
It might make your hair dry and will cause split ends
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.
The effects of quasi-permanent colour The quasi-permanent colour is mixed with a low-volume oxidant (1:2 ratio). Different sized colour molecules enter the cortex and are oxidized by the oxidant. Because the oxidant is mild, the colour molecules do not become very large and are gradually lost each time the hair is shampooed. The colour is designed to fade over a period of 12 weeks.
yes
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.
If it isn't permanent colour, yes.