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Table 3 List of samples and corresponding signs

From: Model study of the leather degradation by oxidation and hydrolysis

Tannin group Tannin Reference sample Ageing treatment
Xe H2O2 HCl NaOH
1w 1w 5w 1w 5w 24 h
Hydrolysable Sumac H1Ref H2Xe \({\text{H1}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_ 1 {\text{w}}}}\) \({\text{H1}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_ 5 {\text{w}}}}\) H1Hcl_1w H1HCl_5w H2NaOH
Hydrolysable H2Ref H2Xe \({\text{H2}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_1{\text{w}}}}\) \({\text{H2}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_ 5 {\text{w}}}}\) H2Hcl_1w H2HCl_5w H2NaOH
Hydrolysable Myrobalan H3Ref H3Xe \({\text{H3}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_1{\text{w}}}}\) \({\text{H3}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_ 5 {\text{w}}}}\) H3Hcl_1w H3HCl_5w H3NaOH
Hydrolysable Chestnut H4Ref H4Xe \({\text{H4}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_1{\text{w}}}}\) \({\text{H4}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_ 5 {\text{w}}}}\) H4Hcl_1w H4HCl_5w H4NaOH
Hydrolysable H5Ref H5Xe \({\text{H5}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_1{\text{w}}}}\) \({\text{H5}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_ 5 {\text{w}}}}\) H5Hcl_1w H5HCl_5w H5NaOH
Condensed Quebracho + mimosa C6Ref C6Xe \({\text{C}}6_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_1{\text{w}}}}\) \({\text{C6}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_5{\text{w}}}}\) C6Hcl_1w C6HCl_5w C6NaOH
Condensed Quebracho C7Ref C7Xe \({\text{C7}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_1{\text{w}}}}\) \({\text{C7}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_5{\text{w}}}}\) C7Hcl_1w C7HCl_5w C7NaOH
Condensed Gambier C8Ref C8Xe \({\text{C8}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_1{\text{w}}}}\) \({\text{C8}}_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_5{\text{w}}}}\) C8Hcl_1w C8HCl_5w C8NaOH
Condensed Mimosa C9Ref C9Xe \({\text{C}}9_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_1{\text{w}}}}\) \({\text{C}}9_{{{\text{H}}_{ 2} {\text{O}}_{ 2} \_5{\text{w}}}}\) C9Hcl_1w C9HCl_5w C9NaOH
  1. H, hydrolysable tannins; C, condensed tannins; Ref, new non-degraded sample; Xe, photooxidation; H2O2, oxidation; HCl, acid hydrolysis; NaOH, alkaline hydrolysis; 1w, 1 week; 5w, 5 weeks; 24 h, 24 hours