Discover the porosity and elasticity testing process with Tracey Sajno in this essential MHD testing video tutorial. Porosity and elasticity testing determines the condition of the cuticle and cortex and should be performed during the consultation process to determine if the intended client service is achievable.

Testing is an essential and important part of any hairdressing business and is carried out to properly identify allergic reactions, to fulfil responsibilities relating to health & safety legislation and to maintain the professional image of the salon. Failure to perform tests could cause damage to the client's hair and scalp and result in legal action and damage to your professional reputation.

It is important to follow the manufacturer's instructions when carrying out these tests.