White cement use a month will become a black seam, it was terrible.
白水泥使用一个月就会变成黑缝，难看死了。
Ceramic tile 10 million tick off seam can't use white cement, must choose special tick off seam an agent.
瓷砖勾缝千万不能用白水泥，一定要选择专用的勾缝剂。
Ceramic tile 10 million tick off seam can't use white cement, must choose special tick off seam an agent.
瓷砖勾缝千万不能用白水泥，一定要选择专用的勾缝剂。
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