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Throughout the cosmetic industry in the UK, purple is the colour allocated to cytotoxic and cytostatic waste streams. Cytotoxic and cytostatic substances are those that are toxic, carcinogenic, mutagenic or toxic for reproduction and include medicines such as most hormonal preparations, some anti-viral drugs, immunosuppressants and some antibiotics. The word cytotoxic means toxic to cells or cell killing and cytostatic means cell stopping. In cancer treatment, for example, chemotherapy is cytotoxic as it kills the cells. Cancer treatments that fight cancer cells by preventing them from multiplying are cytostatic. As such, any disposable instruments or objects that become contaminated with the substances while treating patients receiving cancer treatment would be allocated as purple waste.
Other procedures performed in the cosmetic clinic such as botulinum toxin injections are also classified as ‘toxic’ and therefore should be disposed of as purple waste.