Analysis of information sources in references of the Wikipedia article "History of chromatography" in English language version.
p. 115 ... by experimental work it may easily be demonstrated that if we saturate a limestone such as the Trenton limestone with the oils characteristic of that rock and exert slight pressure upon it, so that it may flow upward through finely divided clay, it is easy to change it in its color ...
p. 115 ... by experimental work it may easily be demonstrated that if we saturate a limestone such as the Trenton limestone with the oils characteristic of that rock and exert slight pressure upon it, so that it may flow upward through finely divided clay, it is easy to change it in its color ...