I am writing this to warn other apprentices the danger of refrigerant. I am a first year apprentice that has been doing install, but in the off time of my 4yr apprenticeship they let me ride with service. I was on a simple maintenance and the tech let me do the outside unit. I noticed when putting on gauges to the liquid line that the shrader was very long or something. It was just not right. The caps were not on, but sitting inside the electrical cabinet. My common sense told me it was not right, but i let the pressure to perform get to me. I started unscrewing the liquid line, and it just kept shooting out! I say 5-8 seconds is all it took for this burn. Worst part is you know your hands feeling weird, but you don't even know your burned. It's only hours later that you actually feel burned, and hours after that till you know how bad it really is. I will also tell you it is very painful for days, and not just 5 minutes It's days this hurts!!!!
The image i am showing you is really five seconds damage from just unscrewing from a unit.