Burgundy lab coats are worn by senior demonstrators. During lab days, there is always a dedicated senior demonstrator present in the lab. They oversee the running of the experiments and can answer any queries small or big about anything lab related. They will often be wondering around the lab chatting with students. 

Red lab coats are worn by technicians. Technicians are responsible for preparing experiments and operational running of the lab. If you need assistance relating to chemicals, equipment or instrumentation, they can be found at the hatch or around the lab.

Blue lab coats are worn by demonstrators. Each lab group will be assigned a demonstrator to assist with your practical session. They can help with queries relating to techniques and/or data processing. Many are PhD students, so may have research areas where their specialised knowledge is incredibly helpful to share with undergraduates.

Green lab coats are worn by technicians from the Green Chemistry Centre of Excellence. The GCCE is located on the first floor of F-block, above teaching labs. You may see these technicians in and around teaching labs moving equipment or assisting project students.

Black lab coats are worn by some technicians who run departmental analytical services. For example, some of the department's chromatography equipment is housed in the teaching labs instrument room and you may need to speak to a chromatography technician if your experiment or project includes this technique. 

White lab coats are worn by all undergraduate students. However, other people in the lab may also be wearing white lab coats, such as  postgraduate students who are not demonstrating, academic project supervisiors, or technicians from an area without dedicated coloured lab coats.