Jasper County Democrat, Volume 3, Number 35, Rensselaer, Jasper County, 8 December 1900 — Iron In Clay. [ARTICLE]

Iron In Clay.

Most kinds of clny contain a considerable proportion of iron; the red color of bricks, for example, is due to the presence of oxides of iron. Sand registered the hour* in the Middle Ages. HV>r this purpose black marble dust, boiled nine times in wine, was p favorite recipe with learned monks.