Table 1 Samples prepared in this study

Sample number

#1

#2

#3

#4

#5

#6

Compound or pigment

Copper(II) sulfate pentahydrate (CuSO₄·5H₂O)

Azurite (Cu₃(CO₃)₂(OH)₂)

Smalt (SiO₂·K₂O·CoO)

Azurite + smalt

Base binding medium

Gelatin (C₆₅H₁₀₂N₁₈O₂₁)

Support material

(None)

4.5 mg/cm²-thick Japanese hemp paper

Preparation method

Homogenization and pelletization

Painting on paper support and drying

Element of interest

Cu

Cu

Co

Cu and Co

Mass concentration

0 ppm

1000 ppm

10,000 ppm

28%^a

3.9%^a

Cu 14%^a Co 2.0%^a

Thickness

≈ 7 mm (cylindrical pellet height)

140 µm^b

340 µm^b

190 µm^b