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The value of phenol red and chromic chloride as nonabsorbable gastric indicators
  1. R. J. Clarke,
  2. J. Alexander Williams

    Abstract

    A comparison is made of gastric loss of phenol red and chromic chloride other than by emptying. Chromic chloride appears to be lost by adsorption on to mucus to a considerably greater extent than does phenol red, suggesting that chromic chloride is less satisfactory as a nonabsorbable gastric indicator.

    https://doi.org/10.1136/gut.12.5.389

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