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 abstractanalytical methods that enable visualization of nanomaterials derived from solution selfassembly processes in organic solvents are highly desirable . herein , we demonstrate the use of stimulated emission depletion microscopy ( sted ) and single molecule localization microscopy ( smlm ) to map living crystallizationdriven block copolymer ( bcp ) selfassembly in organic media at the subdiffraction scale . 
 four different dyes were successfully used for singlecolour superresolution imaging of the bcp nanostructures allowing micelle length distributions to be determined in situ . 
 dualcolour smlm imaging was used to measure and compare the rate of addition of red fluorescent bcp to the termini of green fluorescent seed micelles to generate block comicelles . 
 although wellestablished for aqueous systems , the results highlight the potential of superresolution microscopy techniques for the interrogation of selfassembly processes in organic media . 
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