Table 4: Average absorption times (in minutes taken from 5 measurements) of water drops of 3 mm diameter applied to the surface of unpatinated lime plasters, treated with varying concentrations of an aqueous solution of ammonium oxalate with different contact times.
TR1 (2 hr at 3%); TR2 (2 hr at 5%); TR3 (5 hr at 3%); TR4 (5 hr at 5%); untreated surfaces (CTRL)