Borax flexure full of brimstone sulfur
Borax is a white mineral that is sometimes used to make glass and ceramics (in reference to the last line).
In this line’s context, Boric Acid is a compound that can be created from a reaction (here the term “flexure” is used) between sulfuric acid and borax.
Brimstone is also another name for Sulfur.
Boric Acid’s chemical makeup kinda spells Hobo…
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