There are severe inhalation hazards.
Yes
Freon is a tasteless odorless gas that is used to cool refrigerators and air conditioning units. Limited exposure to the gas is generally not harmful, large amounts however can be poisonous.
old refrigerant is a gas and needs to be pumped out or removed via vacuum with the proper machine which deposits it into the same type of tank that new refrigerant is contained in because of pressure. evacuating refrigerant into the air is dangerous and if inhaled is poisonous to people. not to mention illegal if in California. You could try one of those conversion kits from r12 to r134 hooking up the hoses may allow refrigerant to flow into an empty refrigerant btl.
Refrigerant compaticilty is about suiting the refrigerant to your refrigerant system. Every cooling system has refrigerant in it which depends on the type of system you use. If the refrigerant not matches with your system, it wont work. This is refrigerant compatibility.
Disposable refrigerant containers are only used for virgin refrigerant.
R22
R22
No.
A poisonous mushroom is a poisonous mushroom
A poisonous mushroom is a poisonous mushroom
The type of refrigerant that an E 34 needs is R12 refrigerant. It is absolutely necessary that you do not put any other type of refrigerant into a R12.
You cool it and run it through a metering devise.