Word: disodium
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Dates: during 2000-2009
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...antis make much of the fact that AB-57 -- a dilute solution of ammonium bicarbonate, sodium bicarbonate, a fungicide and gelling agent in water -- has been used for cleaning stone. But on stone it is left for between one and 24 hours and is strengthened by the disodium salt of EDTA, a substance that aids in the removal of calcium compounds; on the Sistine frescoes it is used in a weak solution, in varying applications lasting at most three minutes. It is an efficient solvent but a bland reagent. The fear that the cleaning has taken off any of Michelangelo...