Acid perming, acid digital perming, acid volume rebonding
yoojean 
No ammonia, no alkali. These products are for one who has dried hair or one who got chemical many Times.
But don’t forget that none alkali is not always good for preming. Bcoz sometims it takes a lot of time to have done your perming or have just little bit curls means not enough waves, without alkali, hard to open cuticle..
Recommendation
coloured hair.