Any material containing iron or steel is subject to rusting when exposed to air or moisture. If you pull apart an old fence, you will always find rusted nails in the wood where moisture has rotted them. The modern way is to use galvanised nails or specially coated screws instead. In any hardware store you will see green and brown screws made for outdoor use.
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No, it was painted by Leonardo di vinci, who was Italian.
The Last Supper was painted in the dining room of a church in Milan
Many painters have painted the last supper. But you are probably referring to Leonardo da Vinci's "The Last Supper". It is not actually a painting, it is a mural (wall painting). It was painted on the wall of the refectory of the Convent of Santa Maria delle Grazie, in Milan.
1. Use Less of the material. 2. Recycle used material into NEW.
In 1498, if you mean the one by Leonardo. There are hundreds of others.