# Mixing Oxalic acid and glycerin

I am doing an experiment for a miticide for honey bees. I will be dissolving 600 g of 99.6 % oxalic acid in one liter vegetable glycerin at 150 °F. I have been told it will give off formic acid fumes while mixing and heating. I don't think it will until it get to the melting temperature of oxalic acid. Is there any safety concern? Also what would the shelf life of the mixture be?

• 150 °F is about 65 °C, for those who are wondering. – Martin - マーチン May 17 '17 at 7:27

• "Formic acid has almost unlimited shelf life if unopened and is protected from heat and light sources." I have read it needs to be stored with a vent because of slow decomposition $\ce{HCOOH -> H2O + CO}$ – Poutnik Oct 12 '19 at 5:36