What type of freon does a '93 Honda Civic use?

I believe that car is on the R12 system. However, you can not purchase R12 freon unless you are a Certified Technician and you have your Freon card. So, what I have done in the past, is convert the system to R134A. You can do this by simply buying a Retro Kit for about $30.00 to $35.00 and you can complelety eliminate the old freon. If you are technically inclined, you should be fine doing this on your own. Otherwise, consult a professional, because A/C systems can be very touchy.