I recently bought a house that was built in the 50's. The previous owner had attic insulation blown in at a later time than it was originally built. However the owner has died so I don't know when it was blown in or what type of insulation it is. My father-in-law says it is asbestos, but my dad says it isn't.
The insulation is gray fluffy material. How do I identify what type of insulation this is and if it is possibly asbestos?