A method of preparing an aqueous composition for treating leather comprises adding a predetermined amount of a solid particulate leather treatment composition directly into a predetermined amount of water in a vessel at a tannery; and dissolving or dispersing said solid particulate composition in said water. The solid particulate composition comprises 0.1 wt% or more based on the total weight of said particulate composition of a particulate hygroscopic material. The solid particulate composition is non-dusting in humid atmospheres.
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