In neutral solution a quaternary complex of aluminium can be formed in red colour with NaF, xylenol orange(XO) and cetylpyridine bromide.

• 在氟化钠、二甲酚?~(XO)及溴化十六烷基吡啶(CPB)存在的近中性溶液中,铝可形成红色的组成比为Al:F:XO:CPB=1:2:1:1的Al-F-XO-CPB四元络合物。