At Krugobajkalka, a couple of kilometers from Port Baikal, where graffiti, rocky drawings and others are found on the rocks, there was Vasya, quite high painted someone's name, "1985" and a symbol of the festival of youth and students. Brightly, clearly, has not been washed off by rain, not a drop since then! The buildings painted in 1985 have been repainted many times. Or left irrevocably.
Someone in 1985 knew where to get an untouchable paint.
And did not tell anyone.