Natural product obtained from the firing of limestone "with a degree of purity >98% in Calcium Carbonate" in handcrafted kilns, using as biomass fuels. This firing process lasts for 4 to 5 consecutive days, reaching 900ºC to 1000ºC. After completion, it rests for 2 to 3 days inside the oven in order to cool and allow its handling. It is removed from the oven and stored in a totally air- and humidity-tight tank in order to keep it completely intact. After the sequence of processes described above, it is gradually subjected to careful selection processes in order to eliminate waste produced during