> Through the 1970s conservators deployed biocides, chemicals—including antibiotics and formaldehyde—that wipe out microbes indiscriminately. [...] But just as broad-spectrum antibiotics can wreak havoc on the human gut by eliminating good bacteria along with the bad, biocides can open the door to even more harmful microbes by clearing out the competition.
> Scientists think decades of treatment with biocides in Lascaux led to the proliferation of a fungus called Fusarium solani that covered the cave like snow in a matter of days. The biocides are also thought to have allowed antibiotic-resistant strains of bacteria and fungi to grow unchecked in the cave, as well as pigmented fungi that left permanent dark stains on the Ice Age images. In Europe, the use of biocides is now tightly restricted.
This seems to have ramnifications far beyond the museum:
> Xerophilic molds can colonize human tissue in immunocompromised people—doctors found colonies of Aspergillus fumigatus, another mold involved in museum infestations, in one Danish woman’s brain, chest and lungs after she had been treated for leukemia in the contaminated wards.
EDIT: Aspergillus penicillioides is mentioned in the article and it can survive in both anaerobic and aerobic conditions
There is kind of a cost/preservation/accessibility triangle with curatorial preservation, and museums already normally choose storage that is somewhere other than the most expensive/best preservation corner of that triangle. Oxygen-depleted facilities significantly extend that corner, but if we're already not using what we have there then it may not be a useful addition.
Low-oxygen environments also have their own preservation issues. I'm not actually a museum curator so I don't know the specifics. But it is a very complex and old discipline and they've tried just about everything. The problem is usually funding, which unfortunately boils this whole thing down to another boring "you can't solve social problems with technical solutions."