Table 2 Comparison of the atomic percentage of elements in the historical brick sample and the purchased brick.

From: Application of nano-pico geotechnics and nano-pico heritage spray techniques for restoring and protecting historical brick buildings

Element

Sample

Fe

Ca

K

Cl

Si

Al

Mg

Na

O

Historical Brick

1.08

7.07

0.69

1.59

12.78

4.85

1.96

1.81

68.17

Purchased Brick

0.95

5.18

0.90

0.10

13.11

4.94

1.91

0.66

72.25

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