Fig. 4
From: Investigating the effect of nanolime treatment on the drying kinetics of Clipsham limestone
a Optical microscopy results for a control sample (C0), the samples treated with E5 (C1–C4) and those treated with E25 (C5–C8) following the 28 day curing period at T = 20 °C, % RH = 75. The red circles 
 indicate areas of nanolime deposits. b Plane polarised light microphotographs of a control (C0), E5 sample (C4) and E25 sample (C8) after 28 day curing period at T = 20 °C, % RH = 75. The samples were impregnated with resin to prevent disintegration and dyed blue to help discriminate pores from the stone matrix