Methods of changing or altering the color of building bricks, tile, or other ceramic units
阅读：548发布：2023-10-18
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1. A METHOD OF IMPARTING A SUBSTANTIALLY PERMANENT COLORATION TO THE SURFACES OF BUILDING BRICKS, TILES AND OTHER CERAMIC UNITS FORMED FROM IRON-BEARING RED-BURING CLAYS OR SHALES, WHICH COMPRISES APPLYING TO A BRICK OR OTHER UNIT, BEFORE FIRING A COATING COMPRISED OF A LIQUID CARRIER VEHICLE, A METALLIC COMPOUND WHICH NEUTRALIZES THE COLORING POWER OF THE IRON BY COMBINING AT HIGH TEMPERATURES WITH THE IRON PRESENT IN THE SURFACE LAYERS OF THE BRICK TO FORM CRYSTALS LIGHTER IN COLOR THAN THE NORMAL RED-BURNING CLAY FROM WHICH THE BRICK IS FORMED, AND A RELAVIVELY SMALL QUANTITY OF A COLORANT HAVING THE PROPERTY OF ALTERING THE COLOR OF THE NEWLY FORMED CRYSTALS OF ALTERING SURFACE LAYERS OF THE BRICK BY DISPERSION THROUGHOUT THE CRYSTALS, WHEREBY TO PRODUCE A DESIRED COLOR, AND THEN FIRING THE COATED BRICK IN ACCORDANCE WITH CUSTOMARY FIRING PROCEDURES.
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