Red coral: The red coral is the only type of the Corallium of the Mediterranean Sea, which goes from Greece and Tunisia up to the Strait of Gibraltar, Corsica, Sardinia, Sicily and the Balearic Islands included, it is also located in the eastern Atlantic in Portugal, the Canary Islands, Morocco and Cape Verde Islands, approximately up to 200 meters deep in places with little light with little vegetation
Silver: is the chemical element in the periodic table which has the symbol Ag (from the Latin Argentum) and atomic number 47. It is a soft, white and shiny transition
metal;
silver is the best conductor of heat and electricity of all metals, and is found in nature both pure and in the form of a mineral. It is used in coinage,
in
photography and in jewelry, in which silverware is the protagonist of an entire branch, which includes cups, kitchens, trays, frames and table cutlery.
Silver is a very
ductile and malleable metal, barely harder than gold, with a white metallic sheen that is accentuated by polishing. It has the major
electrical conductivity among all
metals, even higher than that of copper which, however, is more widespread due to the lower cost.
Pure silver, among metals, also has the highest thermal conductivity,
the whitest color, the highest reflectance of visible light (poor instead in the case of
of ultraviolet light) and lower impact resistance. Silver halides are
photosensitive and the effect produced on them by light is the basis of
analog photography (i.e. on film and chemical paper).
Silver is stable in pure air and pure
water, but darkens when exposed to ozone, hydrogen sulphide or air containing traces of compounds of the
sulfur. In its compounds, silver has an oxidation number +1,
and is so malleable that sheets as small as 30 µm can be made.