For that reason, anyone being offered what appears to be high-quality coral cheaply would do well to view the matter with a certain degree of scepsis. 另外，染色珊瑚的颜色表里不一，染料集中在小裂隙及粒间，颜色外深内浅，不均匀。
It is necessary to gurantee defenite concentration of sodium hydroxide and sodium hydrosulfite for enhancing coloring quality in colorating. 用还原染料靛蓝染色时，为提高染色质量，需保证一定的火碱浓度和保险粉浓度。
The coloring of food is against the law in some countries. 给食物加上色素在有些国家属违法行为。
Our drinks are free from all artificial coloring and flavoring. 我们的饮料不含任何人工色素和调味剂。
