Working on an older container not reaching 2c, had been running on R134a and the copeland semi cycling on L.P. Closed off reciever when i found 3/8 drier cool on outlet. The distance between reciever and drier about 4 foot. Cycled Lp several times manually untill compound gauge stopped rising then undid drier flare on the outlet side, great, then started unscrewing flare on inlet and contaminated "chocolate" coloured oil oozed out. Wriggled the nut then BANG WHOOSH! When i could see again the flare was still on the drier and the contents saturated me from a to b. Completed the job, kept the faulty flare and drove home( 30mins) in my jocks.