Fig. 8From: Nano calcium carbonate versus nano calcium hydroxide in alcohols as a deacidification medium for lignocellulosic paperColor changes (dL*, da* and db* representing ΔL*, Δa*, Δb* and ΔE*) of the samples after treatment of paper P1 in respect to the untreated (U) and unaged sample. Error bars represent standard deviation of triplicate measurementsBack to article page