Alizarin complexone is obtained by the condensation of alizarin with formaldehyde solution and iminodiacetic acid in the presence of alkaline conditions.

络指示剂是在碱性条件下由、醛和亚氨二乙酸缩。

So the mixed indicator of phenolphthalein with alizarin red-methyl red could be used as the new indicator for the alkalify water determination.

采用百里酚蓝-酚红、溴酚绿-红混和指示剂的测试效果较差。