Obs. [ad. Ger. clär, kläre, in same sense, f. klar clear, thin, fine.] See quot. 1753.
1683. Pettus, Fleta Min., I. I. vii. § 1. How good Clar is to be made…. Take these burnt Ashes … grind them … very fine … that they may be very clear (of which clear preparation the Clar hath its Appellation) [trans. 1580 Laz. Erker Mineralerzt Von welcher klarer Preparirung die Clār dann den namen hat].
1753. Chambers, Cycl. Supp., Clar or Claer, in metallurgy, bone ashes perfectly calcined, and finely powdered, kept … for the covering the insides of coppels [cupels].
