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Heritage Science
Fig. 4 | Heritage Science

Fig. 4

From: Cleaning testing of nineteenth-century plaster surface models with thin polyacrylamide-based gel layers attached to flexible polyethylene films

Fig. 4

Before (i, iii) and after (ii, iv) visible reflectance (i, ii) and UV fluorescence (iii, iv) images of the 2 × 2 cm surfaces of the aged unsoiled and soiled plates, A the uncoated plaster (uc) and (B–H) the plates with the following coatings: B cold pressed linseed oil (CL), C boiled linseed oil (BL), D 6 wt% shellac resin in IMS (SR6), E 18 wt% shellac resin in IMS (SR18), F barite with Ca(OH)2 (BC), G neat barite (BA), and H beeswax (WX)

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