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Heritage Science

Table 1 Tested solutions according to the pH and conductivity of the soiled surface

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

 

Surface

pH

σ (mS/cm)

Solutions*

Tested

Effective

Uncoated gypsum plaster (uc)

5.95–6.34

0.04–0.22

a, b, c, d, h

d

Coatings

Cold pressed linseed oil (CL)

9.19

0.06

g, h

h

Boiled linseed oil (BL)

6.71

0.03

b

b

Shellac6% (SR6)

5.25

0.04

d, e

d

Shellac18% (SR6)

5.27

0.08

a, d, e

d

Barite with Ca(OH)2 (BC)

9.00

0.12

a, c, h

h

Barite 60 °C (BA)

8.54

0.04

a, c, h

h

Beeswax (WX)

6.73–9.15

0.03–0.07

i

i

  1. *Solutions
  2. a. 0.11 M TEA buffered to pH 8 with 1 M acetic acid
  3. b. 0.11 M TEA buffered to pH 8.5 with 1 M acetic acid
  4. c. 0.38 M TEA buffered to pH 9 with 1 M HCl
  5. d. 0.69 M HCl buffered to pH 6 with TEA
  6. e. 0.09 M HOAc buffered to pH 5.5 with 1 M NaOH
  7. f. 0.09 M HOAc buffered to pH 5 with 1 M NaOH
  8. g. 2 wt% CA in DI water buffered to pH 8 with TEA
  9. h. 2 wt% EDTA in DI water buffered with 1 M NaOH to pH 9
  10. i. 70% (v/v) IMS in DI water
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