This section is from "The Domestic Encyclopaedia Vol3", by A. F. M. Willich. Amazon: The Domestic Encyclopaedia.
Reddle, Raddle, or Rud-dlE, a species of marle, found in various parts of Britain, particularly in the counties of Stafford and Derby.
This mineral is of a deep-red colour; and, on being handled, stains the ringers. It consists of clay and oxyd of iron ; falls to powder in water ; and, when heated in the lire, becomes black.
Reddle is used in the manufacture of colours ; in the marking of sheep; and, we understand, has lately been employed in Staffordshire, with great advantage, as a manure.
 
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