First of all I would like to thank Michael Pohlen for his help, suggestions, advise and insightful discussions. I would like to thank Reynier Peletier for providing me with this fascinating research project and giving useful advise and help. I would also like to thank Richard de Grijs for his useful comments on colours and colour gradients and providing us with his observation logs. And last but not least, I would like to thank my fellow students from the old Coma Cluster: Hugo Buddelmeijer, Johan Hidding, Arjen Siegers and Matthijs van der Wiel, for their help, advise, support and making sure I took time to relax during my project.