In the storage of olive oil in transparent glass bottles, important changes may take place due to exposure to light. Because oxidation processes have been observed in olive oils bottled in glass, the effect of the type of glass on the storage of oils exposed to light commonly used in sales areas was investigated. Decomposition of chlorophyll''a'' was used as an indication of oil oxidation. The study shows that the use of colored glass can slow down the oxidation of olive oil.