After an unexpected layover in the UK I thought I’d take some time to start restoring the old RAF bicycle I purchased some time ago. I intend to take off the running gear and get that all serviced and restored. The frame I am unsure of. It has been coated in black paint but underneath the disasterous black paint can be clearly seen the original RAF blue grey colour. Underneath on the frame gearing I found some more serial numbers and on the headset stamped into the frame is RAF then a serial number. Any suggestions as to how to take the black off but retain the blue would be very welcome.