Perfect Outdoor Chessboard - Deep rich brown created from cheap gray 16" square concrete pavers. I used this and the green one to make a chess board in my back yard. Oddly enough, large square pavers come in gray only—or a red with a brick pattern. So I couldn't find 2 colors with the same plain look, and I'm glad I couldn't because staining the plain gray concrete created a unique look that you would not be able to purchase even through special order. Plain gray concrete looks as cheap as it sounds, but now I've got a jade-walnut chessboard that cost me less than $4 per piece to make, including the stain.
Easy to use, and if you use zero water to wet the pavers before applying acid, you get a bubbling, hissing pool of acid, which of course is a bonus.
(wetting the surface first will create a more uniform color and will stretch the amount of coverage).
