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Table 3 Colour change of the Holmen paper caused by the nitrogen jet and the CO2 snow jet (±  SD)

From: Carbon dioxide snow cleaning of paper

 

∆L*

∆a*

∆b*

∆E

ΔE2000

N2 jet

− 0.10 (±  0.37)

0.00 (±  0.15)

0.11 (±  0.28)

0.50 (±  0.15)

0.35 (±  0.15)

CO2 snow jet

− 0.34 (±  0.23)

0.12 (±  0.08)

0.19 (±  0.21)

0.43 (±  0.18)

0.37 (±  0.12)