With the weather heating up, everyone is talking about their AC systems.  In
particular R-12 to R-134a conversions.  What's the hub-bub!  Use a
refrigerant called Freeze-12!  This stuff is legal, is a direct replacement
for R-12, requires no change of any part of your R-12 system, is much
cheaper than R-12, cools better than R-12, and you don't need as much to
replace your R-12 charge!