The limestone pieces were given an antique look with a unique finish of sandblast and acid wash.

石灰石砖在经过喷沙和酸洗加工后展现出独特的风情。

The results of acid wash with different acid concentration, reaction time and acid temperature were discussed.

主要考查了酸溶液的浓度、反应时间及酸溶液的温度等因素对灰份去除结果的影响。