This paper deals with some of the underlying physical properties of kraft lignin during its transformation from dissolved to solid state. The interactions at lignin interfaces are further focused. Fundamental approaches to increase the overall physical knowledge of lignin derivatives by combining relatively simple methods like turbidity with more advanced experimental techniques such as cryogenic transmission electron microscopy, scanning electron microscopy and atomic force microscopy, are treated. The overall message in this report is that many issues related to the isolation, use and development of technical lignins into new products can be successfully addressed through the utilisation of model systems.