To ensure the high quality To best protect premium olive oil from ZOE, we chose a bottle made of Miron violet glass. Violet glass shields the harmful rays of visible light reliably. This means the valuable ingredients are retained for a long time. In addition, Miron glass allows light of wavelengths between 380 and 420 nanometers (violet and UVA frequency) a penetration of 25%-45% and between 730 and 1050 nanometers (infrared frequency) one Permeability of about 60%. There are voices that say this is particularly beneficial for natural products.