A/C is leaking. The green dye is used to find small leaks. Your supposed to youse UV light and tinted glasses to find the little leak, needless to say you dont need the light.
If you want your AC to work tho all you have to do is follow it to where ever it is leaking from the A/C system. Since you can see it that typically means their is a large like like a seal blew out or a hose has a hole in it. Find the leak and fix it you could probably get it working again
Definitely what you're looking at is A/C refrigerant leak dye....however I'll bet your compressor shaft seal is blown. Mine had the same problem whenever I would turn on the a/c. A new compressor was/is the fix.