Generally speaking, non-professional feeding institutions are not good at using essential oils. At best, they just fiddle around and ask around. Real essential oils will not contain heavy metals unless the place of origin is polluted. However, some trends of essential oils can whiten the skin, which is reflected in the dark discharge of the body (representing that toxins are not blocked from being excreted) and naturally become white. But there won't be that white with shapes, but that piece may be very bright. If it is bleached, be careful.