Van Meerbeek has presented his tracers in the Photo Chemistry section before, and this time it is also an intermediate for a potential new tracer that the Interventional Molecular Imaging Laboratory could use for image-guided surgery. ‘What surprised me about this dye is that it has a very bright blue colour  in solution’, said Van Meerbeek. ‘But in solid form, as in the picture, it’s almost golden. It’s really bizarre, and I still don’t have a good explanation.’