Fig. 10

Preservation treatment on Roth´s collection Catalogue No. 5 at PIMUZ. Unidentified, old consolidant ageing: yellowing and flaking (A). Unidentified adhesive, yellowed, sticky, and chemically irreversible (B). Labelling in 3 steps: application of 20% Paraloid B-72 in acetone as a protective base layer (C); label written with india ink and quill (D), and gentle application of 20% Paraloid B-72 as a top coat (E). Application of the top coat may sometimes cause numbers to run. Sufficient drying time is needed between each layer. A 50% Paraloid B-72 solution was sometimes used as a top coat. In E, the label was written on a layer of titanium white acrylic paint, after the base coat, for contrast. Housing process: "Cavity" mount out of ethafoam according to specimen’s contours (F); cushion the cavity with polyester batting (G), and cut outline around cavity and tuck Tyvek material (42 g/m²) into a slit to secure in place (H) (Dzinak, 2017)