Application of seven borane complexes in paper conservation

Seven borane complexes were tested for aqueous and non-aqueous conservation treatments of paper. All the reducing agents gave very good results when u sed in aqueous solutions with an effectiveness of 66 divided by 88% before ageing and 30 divided by 52% after 28 ageing days. The best results were obtained from borane ammonia complex (AB), borane ter t-butylamine complex (TBAB) and borane N,N-diisopropylethylamine complex (D IPEAB). The latter, unfortunately, leaves an unpleasant residual odour on t he treated papers. AB and TBAB can also be used in organic solutions, enabl ing the treatment of graphic media soluble in water.