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jeff80-
I think it's cement spray or some kind of flooring screed overspray. I need to clean it off and check the disc over really because I don't know if sitting in the south facing sun for 5 months has done it any favours. The other sidewall of the tub is looking decidedly more suntanned than this side.
It's old Russian though. So far it has survived cold war, communism, fall of the Soviet Union and now global apocalypse and a little bit of neglect. It'll be fine.
Jonny69
Reader’s alert. Retrieved this from work today. Been sat in the bike shed for 5 months during lockdown and has dropped firmly back into rat territory. Disc has picked up some interesting spray pattern on one side from whatever the contractors have been doing on the side of the bike shed.