Disclosed is a method for treating a grained material. A nonlimiting example of the method includes the operations of providing a workpiece having grains, exasperating a surface of the workpiece to open the grains, applying at least one coat of a base paint to the exasperated surface, applying at least one layer of clear coat on the base paint, applying at least one of a glaze and a paint on the clear coat, and surface treating to reveal grains of the workpiece. Disclosed also are items of furniture and sheet materials treated by the aforementioned process.

To provide a high emissivity coating composition capable of exhibiting a higher emissivity at a low elevated temperature and substantially reduced formation micro craze when coated upon a substrate, and enabling a simplified application process, a high emissivity coating composition, comprising a powder mixture for providing emissivity; a binder for providing adhesion; and a co-binder for promoting adhesion and film-forming, characterized in that the powder mixture comprises at least three metal compounds of formula A.sub.(y3)B.sub.y/2O.sub.y, wherein y is 4; A is selectable from a group of Ni and Co; B is selectable from a group of Fe and Cr; and O is oxygen; and the co-binder is an aqueous solution comprising silica in a compound of Formula (1), wherein R.sub.1 is HSi(CH.sub.3).sub.2; and a compound of Formula (2), wherein R.sub.2 is CH.sub.3, is disclosed herein.

A surface finishing apparatus and method for smoothing and coloring parts made by additive-manufacturing technologies is disclosed. The surface finishing apparatus includes a tank or chamber into which a part is placed. A colorant is added. The part is both colored and smoothed until the part is at a desired smoothness and color. The part may be smoothed by different suitable smoothing technologies, including abrading with solid media, spraying with a liquid fluid, spraying with solid particles entrained in a liquid fluid, or submersing in a liquid vortex. Also disclosed is a composition for a colorant for a finishing process that smooths a surface of an additively manufactured part while coloring the additively manufactured part.