1911 Encyclopædia Britannica/Copalite

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COPALITE, or Copaline, also termed “fossil resin” and “Highgate resin,” a naturally occurring organic substance found as irregular pieces of pale-yellow colour in the London clay at Highgate Hill. It has a resinous aromatic odour when freshly broken, volatilizes at a moderate temperature, and burns readily with a yellow, smoky flame, leaving scarcely any ash.