embroidery 20th century Casse Noisette contamination health safety danger Royal Museum of Mariemont giraffe archival materials mannequins reconstruction Leather storage preventive conservation Code of Ethics for Museums diversity of backgrounds feelings Fabrics heavy metals contents Bibliography allergens QR code archives SPECTRUM mercury deterioriation Mantas bobbin lace symbolism portrait crochet mask Accessories silk festivals dictatorship knitted lace shoes crucifix collecting policy manufacture surface satin stitch collection apron vacuum collar weaving Pattern-taking midget collecting costume Kongedragter protection from evil personal identity Rayon hospital Belgium nurse public accession number