These visualizations are powerful in that they demonstrate how toxicity is not solely about chemicals, pollution, etcetera, but is a condition produced by social mechanisms of marking space (both literal and conceptual) in an oppressive fashion.
This analytic does not map directly to M. Azzara's essay but in addressing the questions I will reflect on her "Description" and images #1 (Archive Toxics 3) and #2 (Archive Toxics).
What is striking about the visualization #1 is the presentation of surfeit—all these cataloged containers of preservation that assure viewers our past is well-tended. M. Azzara's visualization calls attention to the absences of documentation of the lives of Black pioneers in early Los Angeles history. Her work examines these absences as a form of toxics.
Image #2 is M. Azzara's response to this toxicity by creating an superimposing the spectral presence of Biddy Mason in a photo of white settlers.
These visualizations advance ethnographic insight by revealing the silences in our histories and further suggest a way to counter silences through imaginative (productive) retellings while problematizing archives as toxic places.