Colored chalk / no-chalk ethics are found in some areas. Since chalk does discolor the rock, using colored chalk that is designed to match
the color of the rock you are climbing on is helpful. No-Chalk Ethic indicates that chalk should not be used in this area.
Climbing chalk is normally held in a chalk bag. Chalk bags cost approximately fifteen dollars, though you can make your own for a few bucks. Make sure your chalk bag opens and closes easily, but especially closes securely to prevent chalk spills. Also you want a string that goes around your waist so you can pull the chalk bag back and forth at will. This is considerably nicer than clipping
the chalk bag to the back of your harness
with a carabiner.
Chalk bags are worn at waist level.