density inversion

in solvent extraction
https://doi.org/10.1351/goldbook.D01591
The interchange of the denser and less dense phases due to changes in solute concentration. @P04530@ is often used in this context but is ambiguous.
See:
phase inversion
Source:
PAC, 1993, 65, 2373. (Nomenclature for liquid-liquid distribution (solvent extraction) (IUPAC Recommendations 1993)) on page 2387 [Terms] [Paper]