The influence of different heating methods on the chrome tanning process.

Time (h)	WB			T s (°C)	MW			T s (°C)
	pH	R value	Cr2O3 content (mg kg−1)		pH	R value	Cr2O3 content (mg kg−1)
1	2.66	1.1856	7.96 ± 0.38		2.64	1.1749	9.52 ± 0.35
2	2.72	1.1970	12.16 ± 0.44		2.70	1.1930	14.15 ± 0.51
3	2.68	1.2015	15.84 ± 0.81		2.65	1.1964	18.36 ± 0.66
4	2.66	1.2038	18.26 ± 0.51		2.62	1.2007	21.62 ± 0.94
5	2.65	1.2044	20.02 ± 0.81	73.5 ± 2.1	2.62	1.2002	22.66 ± 0.58	85.6 ± 2.8
6	2.73	1.2119	21.62 ± 1.03		2.70	1.2065	25.84 ± 0.93
7	2.94	1.2392	29.79 ± 0.63		2.89	1.2328	33.11 ± 0.70
8	3.18	1.2595	35.23 ± 0.87		3.16	1.2452	39.54 ± 1.17
9	3.48	1.2981	39.56 ± 1.33		3.44	1.2758	44.08 ± 1.03
10	3.89	1.2942	41.88 ± 0.51	103.0 ± 1.5	3.83	1.2872	47.15 ± 1.75	109.3 ± 2.7