Prohibited materials; materials that should not be used in perfumery e.g. toxins, carcinogens etc.
Restricted materials: materials that should only be used at lower levels. e.g.
Special Quality Materials; materials that should be free of solvents such as Benzene or irritant factors such as 5-methoxypsoralene in cold pressed citrus oils.
Quenched materials; materials that although irritant in themselves may be quenched (the militancy counteracted) when used with other materials. Notably the use of certain aldehydes which as a group tend to be irritant with their related alcohols ; Cinnamic Aldehyde plus Cinnamic Alcohol, Phenyl Acetaldehyde plus Phenyl Ethyl Alcohol.
Prohibited materials