Cobalt Blue Glass Jar (Large)
Cobalt Blue Glass Jar with Black Lid. 9oz sizeCobalt blue jars or bottles are used for storing essential oils. When used with a tight lid, cobalt blue bottles can help avoid evaporation and protect the essential oils from receiving sunlight, which causes deterioration within the oil. Protecting essential oils from sunlight and open air are the two main factors in keeping oils fresh during their shelf life.