Anyone who has visited Milan to see The Last Supper by Leonardo da Vinci knows — it's not so easy. The Last Supper is a fresco, in bad condition, painted on a wall in a gloomy room. Leonardo da Vinci loved to experiment with mediums, techniques, and substrates. In this case, the experiment failed in that the fresco started to deteriorate a few years after Leonardo finished it.
The Last Supper
tempera on gesso, pitch and mastic • 460 x 880 cm
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Leonardo da Vinci