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

茜素络指示剂是在碱性条件下由茜素、亚氨二乙而成。

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-红混指示剂的测试效果较差。