200
The more ________ a product has the more damage it can cause to the hair and skin.
All hairdressing students must be aware of any ________ reaction that could occur if products are not used properly and safely.
A trailing wire from a blowdryer or curling rod is a ______ in a hair salon.
Health, safety and _______ are the most important factors to be considered in the salon.
Hair consists of a protein called _______.
Neutralising removes the hydrogen from the cortex by adding oxygen, a process called _________.
The chemical formula for hydrogen ________ is H2O2.
You must remember to _________ all equipment used between clients to avoid contamination.