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I see that some of the flies in my box have become very greasy. First I thought maybe it had something to do with stomach content or maybe pollen or other external ‘pollutants’.
But I also have reared specimens that have turned out this way so in those cases it can’t be stomach content and probably not any other pollutant... I usually do not pin flies while eating chicken wings 
Could it be that the specimens have not dried enough before I have moved them to the box? I think the box is pretty air-tight (entosphinx trype).