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NCPTT tested limewashed handmade and modern brick samples using artificial weathering, adhesion, and abrasion testing according to ASTM standard methods. We photographed samples before and after each test and monitored them for color change with a Minolta colorimeter. To perform artificial weathering, we placed the samples in a QUV weatherometer and subjected them to four hours of UV light exposure and four hours of condensation in the dark continuously alternating for 800 hours. This accelerated weathering gives us an idea of how the limewash may age over time. For the adhesion test, we cut an “X” through the limewash to the sample, and then placed pressure sensitive tape over the cut. Upon removal of the tape, we assessed how much limewash was removed. This test evaluates how firmly the limewash bonds to the samples. In the abrasion test, we placed samples in a holder and poured measured amounts of falling sand on to the surface to determine how much sand is needed to remove a 4 mm (.1575 inch) diameter circular area of limewash. The abrasion test allows us to rank how a limewash will stand up to abrasion from windand rain-borne particles and from people touching the buildings. With the help of Quality Finish, we also performed a solids test to determine how much limewash is being applied to the samples.

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