Well, R12 is, yes.
r-12
R 12 refrigerant.
R-12 refrigerant can be identified in a recovery cylinder by its unique chemical properties and color. R-12 refrigerant is a chlorofluorocarbon (CFC) with a pale yellow color. It can also be confirmed using a refrigerant identifier tool that can detect the specific type of refrigerant present in the cylinder.
R-134a is the only refrigerant approved by the automotive industry. It requires conversion to be used in an R-12 system.
Refrigerant R-290, which is propane, is a flammable refrigerant unacceptable under SNAP as a substitute for CFC-12 due to its safety concerns related to flammability.
You really need to flush out the old stuff. But any garage can do it if they will.
never mix these freons together---- very dangerous
R-12 refrigerant can cost between $30 to $50 per pound, but prices can vary depending on the supplier and location. Since R-12 is a restricted refrigerant due to its ozone-depleting properties, availability may also be limited.
R-12
R-12 is the coldest
Most vehicles made before 1994 use R-12 refrigerant.
R-12 is very harmful to our enviroment.