Years ago I bought a bottle of methylene blue for staining slides. The scope and gear got forgotten about until recently and I had a look at some 'clean' slides and found one that had some dried meths blue on its edge. I got curious and so popped it under thse scope and lo and behold, blue crystals have formed!
Its quite hard to see the stuf itself as its formed opaque clumps but I definitely see crystals!
