formaldehyde, a medical preservative and disenfectant, when it is exposed to air, one of the resulting chemicals formed is formic acid.
Formaldehyde is know to cause cancer in some instances
it is also used in embalming fluid. I wonder if formic acid has some of the
bad properties of it. Formic acid is also found in the sting of ants and some plants, I understand it to be the thing that causes the pain in
stings from ants and plants. I would not want to expose my bees to it.