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Mold
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===Health Concerns===
A small number of molds can produce poisonous substances called mycotoxins, or cancer-causing poisons called aflatoxins. Some molds that do not produce toxins can still cause allergic reactions or respiratory problems <ref name="usda"></ref>. Their effects can be accumulative, rather than immediately toxic as in the case of pathogenic bacteria. As a general rule of thumb, pigmented molds (non-white/grey) are more likely to produce poisonous substances (especially black mold which could be ''Aspergillus''), however there are exceptions to this guideline <ref name="Bryan">[http://suigenerisbrewing.blogspot.com/2016/08/fact-or-fiction-can-pathogens-survive.html "Fact or Fiction? Can Pathogens Survive in Beer - Mould Edition." Bryan of Sui Generis Blog. 08/11/2016. Retrieved 08/11/2016.]</ref>. Some mycotoxins can survive boiling temperatures in wort to varying degrees, so if mold develops during processes such as kettle souring, it is possible for some percentage of mycotoxins to survive the wort boiling process and fermentation (one study showed that 20-30% of two mycotoxins were removed during boiling and fermentation) <ref>[http://www.sciencedirect.com/science/article/pii/S0168160507003984 Stability of mycotoxins during food processing. Lloyd B. Bullerman, Andreia Bianchini. 2007.]</ref>.
Identifying mold based on what it looks like is not a reliable way to determine if a mold is a cause of concern for health <ref name="Bryan"></ref>. If mold is present in beer, it might be possible for commercial breweries to remove the mold and send it to a lab to check if it is a toxic mold before allowing the beer to be consumed. Some homebrewers may decide to risk taking a chance that the mold will not cause illness, however we recommend discarding beer that has come into contact with mold, especially if serving to others. Mold growing on soft fruits and vegetables with high moisture content can be contaminated below the surface, therefore beer or wort could also be contaminated if the mold was growing only on the surface <ref name="usda"></ref>.