Posttraumatic stress disorder (PTSD) The black exhaust Black is apparently a depressing color. The reason ought to be rich mixture. That is to say, the mixture of gas in cylinder component is at night normal level. The incomplete combustion gas inside the combustion chamber make the carbon particle exhausted with the waste gas. Failure probably will come from the following reason: The proper strategy of balance climbing requires the following: v Eyes. As a climber, you should view the entire route selected to climb. Use your eyes to climb the pitch. You should identify handholds and footholds, possible belay positions, alternate routes, rest spots, plus a route for down climbing or descending. You must make use of your eyes continuously to look for subsequent handholds and footholds, and rest positions. As well as to continue planning and revision from the route. v Body Position. As you move and climb, the body must be in balance; that is, unwanted weight has to be centred over your feet. Use your hands mainly for balance, and you weight together with your legs.