Gardenia yellow is unstable in sunlig ht,and it has a poor tolerance ag ainst Na 2 SO 3 .Cu 2+ ,Zn 2+ ,Sn 2+ ,Ca 2+ ,Al 3+ hardly affect the color and stability of the pig ment,but Fe 3+ damag es the pig ment.

• 色素耐日光性较差,耐氧化还原能力一般,对Na2SO3耐受性较差; Cu2+、Zn2+、Sn2+、Ca2+、Al3+对色素影响较小,Fe3+对色素有破坏性影响。