ARTIFICIAL COLORING OF ROCK

THE CENTRAL TESTING LABORATORY IN AUSTRALIA DEVELOPED A SOLUTION OF TANNIN, IRON, AND PHOSPHORIC ACID WHICH IS SPRAYED ON THE ROCKS TO IMPROVE THE RAW LOOK OF THE CUT SURFACES. THE FIRST SOLUTIONS FADED BADLY SO CARBON BLACK WAS ADDED. THE PRESENT SOLUTION STANDS UP WELL TO SUNLIGHT AND RAIN. DRAINAGE DITCHES, LINED WITH CONCRETE HAVE PROVED MORE DIFFICULT TO CAMOUFLAGE, BUT THE PRESENT TANNIN-IRON- PHOSPHORIC ACID-CARBON BLACK COMBINATION IS WORKING WELL. THE COST IS LOW. THE SPRAY IS APPLIED BY A FOUR-GALLON KNAPSACK SPRAY WHICH GIVES AN EVEN APPLICATION WITH LITTLE WASTE. /AUTHOR/

  • Supplemental Notes:
    • Vol 31, No 3, PP 80-81
  • Publication Date: 1966-3

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Filing Info

  • Accession Number: 00234077
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 5 1994 12:00AM