Kolisko Effect

Lilly Kolisko's work links together the planets and their metals, Heaven and Earth. The meetings of the planets were recorded by chemical process. She employed the age-old alchemical notion of specific correspondences whereby a particular metal 'belonged' to a planet; and got it to work by a chemical procedure using the metallic reagents in solution. The metals traced pictures on the papers, pictures having form. That form, typically, faded away during the celestial event, then came back afterwards. Thus the experiments told her when and for how long the celestial influence worked.

(Source: http://www.anth.org.uk/Science/kolisko/ )