Changes

As far as knowing what infected the beer based on what a pellicle looks like, the short answer is that [[Pellicle#Pellicle_Appearance_as_a_Microbe_Identifying_Indicator|you cannot confidently identify contaminating microbes based on what a pellicle or other visual signs look like to the naked eye]]. Microscopy can identify microbes to some degree (genus level), but DNA analysis is needed for species-level identification.

(Please note that questions regarding accidental infections for beers that were intended to be clean beers are considered off-topic in the MTF Facebook group due to the number of these posts we would receive otherwise.)