Olive oil may become rancid if exposed to the light (especially light from the sun or fluorescent lighting), heat and also certain types of metal. At the time of purchase, choose oil sold in a bottle made of opaque glass or in a stainless steel container and store it in a cool, dark place. If you want to transfer your olive oil into one of these pretty bottles with a spout, select a bottle fitted with a cap that will seal it tight after use. Store oil in the cupboard, away from the stove, or even choose a small format which you can refill regularly.
I want to know more about clear bottles with a spout sold in kitchen stores. Olive oil should not be in contact with light, right? Which bottles and what oil are the best?