Figure 9From: Poly(vinylalcohol)-borate hydrogels with improved features for the cleaning of cultural heritage surfacesWater absorption curves of raw stone (diamonds), stone treated with Paraloid B72 (circles) and after cleaning test (triangles). Gels tested are composed by 3% of PVA, 0.6% of borax, 30% of acetone and 0% PEO (a) or 1% PEO (b).Back to article page