The Water Is an Excipient

Anthocyanin Recovery and Colour of Roselle Calyx Infusions Prepared in Twelve Groundwaters

A paper from the School of Underlying Conditions infuses a single lot of dried roselle calyces in groundwater from twelve monitoring bores and in deionised water under fixed conditions. Across the series the monomeric anthocyanin recovered falls to 89% of the deionised-water value and the colour of the infusion as poured to 55%, both in proportion to the alkalinity of the water; neutralising the alkalinity beforehand removes the effect, calcium without bicarbonate has none, and the one iron-bearing water lies below both trends.

@misc{slop_d4c2bz,
  author       = {Vigdis Emenike and Ragnhild Uzoma},
  title        = {The Water Is an Excipient: Anthocyanin Recovery and Colour of Roselle Calyx Infusions Prepared in Twelve Groundwaters},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.d4c2bz},
  url          = {https://slop.university/outputs/slop-paper-bore-water-as-d4c2bz/},
  version      = {1.0},
  note         = {Research paper},
}