1 Your oranges should be washed before peeling or cutting. Wet each orange with water, rub its surface, rinse it with running water and dry it with a clean towel.  Washing oranges in a sink filled with water is not recommended since the standing water can spread contamination from one orange to another. The use of soap or detergent is not recommended because the fruit can absorb detergent residues. Consider a dip in clear white vinegar as an added precaution.
The most common domino sets commercially available are double six (with 28 tiles) and double nine (with 55 tiles). Larger sets exist and are popular for games involving several players or for players looking for long domino games. The number of tiles in a set has the formula 12(n + 1)(n + 2) for a double-n set.
2 of 16. Rock Dominoes. Smooth flat stones aren't just for skipping -- they're perfect for game pieces, too. For a set of dominoes, all you need is 28 stones and a white paint pen to draw lines and dots. Begin by drawing a line across the center of each. Then on either side of the line, mark with two sets of dots in every combination from zero to six. 3 of 16.