We've had night shots, now its the turn of snow cups. Mark my words by the end of the year you'll be dragging a portable snow machine round with yer instead of numerous lamps ;-)
I did once try using the water spray from the side at Hunterheugh to pick out the faint rings, but it didn't work very well. Now I know where I was going wrong. I'd forgotten to take the fridge-freezer.
I doff my cap Sirrah, both to the pic and to your low-temperature lunacy in pursuit of RA :)