When you open the SN, don't leave it open too long. Nitrite converts to nitrate under the influence of oxygen. Store it in an airtight jar in a cool, dry place at a temperature between 5 to 30°Celsius (41 - 86°F). SN is explosive. SN is toxic not only when ingested, but also when inhaled and in contact with the eyes and skin. SN can also be absorbed through the skin.