The effect of duration of water storage for a period of 4 weeks is dark, GAC, the value of L a and b are in the same trend is the L in the range 37-41 a value in the range of 14-19 b values in the range 14-20 and compared different watercolors, water control and concentration GAC GAC more Sodium benzoate and Potassium sorbate is the difference of a few colors in the range of 0.5 – 4.
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