Answer:
Cold Waves
Step-by-step explanation:
Cold Waves -
This type of wave are used to curl the hairs without the application of any type of heat and along with it , thioglycolic acid or any of its derivatives are used along with ammonia , during the process of curling .
The cold wave use some small or medium size plastic curlers and obtaining a result of medium curls which are more prominent when they are wet .
For better results hair products like mousse , setting lotions are applied .