How can I tell if the chemicals I work with are dangerous?

Read the label. Under the law chemicals should come – and be kept – in properly labelled containers. The label gives you important information about the hazards of the substance, for example if it is toxic or likely to cause skin burns or allergic reactions. The Health and Safety Executive's website has information on working with chemicals, including an explanation of the safety symbols and codes used on chemical containers. www.hse.gov.uk/chip

At present suppliers can choose to label chemicals under the CHIP Regulations (black symbols on orange squares) or the new Classification, Labelling and Packaging (CLP) Regulations which came into force in January 2009 (black symbols on white with a red diamond-shaped border). There is a period of dual running until classification and labelling according to CLP becomes mandatory for substances on 1st December 2010 and for mixtures on 1st June 2015.  After these dates CLP symbols must be used, and CHIP symbols will no longer be permitted.

Ask about the safety data sheet. The product should also be accompanied by a safety data sheet, which gives you more detail about a substance's hazards and the precautions you need to take. Your employer should keep copies of safety data sheets for the products you use, and should tell you how to use the products safely.