Acid pattern is the process of giving depth to the surface, which has been pre-prepared with acid pattern pickling and whose pattern has been transferred by transfer, using appropriate acid according to the type of steel. During the acid pattern, the air temperature ratio, acid temperature and bomesis are the points to be considered. Ventilation should be considered while making acid patterns. It should be known that acid is a dangerous substance when inhaled. Acid pattern should also be built with appropriate acids and well-ventilated and treatment facilities. During the acid pattern, the desired pattern depth in the steel should be adjusted well, and the depth-giving process should be applied according to the structure of the steel. After the acid pattern, the piece should be cleaned very well.