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CHARAS PROJECT, THE SAVEVENICE AREA
The step by step process
Marine engines has not catalytic mufflers as cars does;
The sulphur emissions are, obviously, much higher than for cars;
Result of this is the air is full of sulphur dioxide (sulphurous anhydride);
Definition: CALCITE - it is crystalline calcium carbonate (CaCO3);
Venice is built mainly with "Istria's stones", very rich of CALCITE veins;
Without these veins stones lacks coesion, becoming a sort of "rock mosaic";
So without these veins, stones will FALL or become really UNSTALBE (physically, i mean);
A formula:
SO2 + H2O = H2SO3
H2SO3 + 1/2 O2 = H2SO4
H2SO4 + CaCO3 + H2O = CaSO4 x 2 H2O + CO2
The forumla translated:
sulphur dioxide + water = sulphurous acid
sulphurous acid + Oxigen = sulphuric acid
sulphuric acid + calcium carbonate + water = chalk + carbonic anhydride
The carbonic anhydride is a gas, so it will "fly away";
So: marine engines and their sulphur emissions transforms CALCITE into CHALK;
Umidity (water in the air) and rain dissolves the chalk;
Istria's stone becomes "rock mosaics", because the sulphur destroy it's CALCITE veins;
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