What is it
Avoca Silver Nitrate Caustic Pencils are designed for multiple use for a single patient. An Avoca Pencil contains approximately 350mg of silver nitrate & potassium nitrate mixture.This is about 10 times more silver nitrate than an applicator. This red carton and red plastic holder signals a 40% silver nitrate mixture. From the date of manufacture, all Avoca Pencils have a 5-year shelf life.
Place a single drop of water, or more if required, on a clean non-absorbent surface such as an upturned drinking glass or stainless steel container. Gently stir the tip of a pencil in the drop of water for about 20 to 30 seconds. Silver nitrate from the tip is quickly dissolved in the water.
Since the tips of applicators and pencils are small and standardised, there is less of a risk of excess being applied accidentally. Silver nitrate is a hazard due to its causticity, and is toxic when taken by mouth. However, absorption of silver nitrate through intact skin is negligible. Due to its chemical reactivity and the fact that it is metabolically highly refractory, there is a low risk of systemic toxicity if applied externally.
Each cutaneous stick contains 40% w/w silver nitrate as the active ingredient . Also contains potassium nitrate 60% w/w.