This is a chemical process where oxygen is added to a compound with the loss of electrons. It is relevant to the beauty industry as it is a process used in hair colourants. It is a requirement of the relevant beauty treatments (e.g. last and brow tints and lifts and hair colouring) to provide a patch test prior to the treatment to ensure that the client is not allergic to the products. For this process manufacturers, instructions should be followed both with the process and the regularity of the tests
