Fig. 5

Images of leather surfaces made with a 3D microscope: (a) traditionally tanned leather, (b) leather tanned with the use of chromium recovered from hydrolysed waste alkaline; Images of leather surfaces made with SEM (over 100x): (c) traditionally tanned leather, (d) - leather tanned with the use of chromium recovered from hydrolysed waste alkaline; EDS maps of surface distribution of chromium: (a) traditionally tanned leather, (b) leather tanned with the use of chromium recovered from alkaline hydrolysed waste.