[Axenolith]

Bottom black containers are Formalin (formaldehyde solution).

[yesthatjallen]

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[STARLIT]

Why would they have Formalin? Embalming.

Formalin is a colourless strong-smelling chemical substance usually used in industry of textiles, plastics, papers, paint, construction, and well known to preserve human corpse. It is derived from formaldehyde gas dissolved in water..

.I guess I answered my own question.