Alum tawing is an ancient process of treating prepared animal hides with aluminum salts and other materials. The skins are then left to dry for several weeks to allow the development of stabilization effects. Alum Tawed skins are typically sort and flexible to the touch, and have a high degree of stretch. https://www.talasonline.com/fabrics-and-leather/leather/alum-tawed-skins
Some people use the air filter for exhaust which probably isn’t rated for all toxic gases. Consider the following; Will it corrode your exhaust pipe or exhaust exit area? Will it mix with other chemicals and react within exhaust equipment or machine? Where is the exhaust going?
Some things that are burned aren’t noxious or considered toxic. Aluminum Sulfate is on the Special Health Hazard Substance List.
Risk is a part of life, we all choose our own!
Actually, I’m wondering if this doesn’t belong in the Beyond the Manual section, where all the settings information is kept…it seems like something that folks ought to know, and the Everything Else category threads get closed after 30 days of inactivity.