Fig. 8From: Gutta percha, natural rubber and balata-chemical characterization of polyisoprenes in the context of cultural heritageThe 1H NMR spectra of fresh latex collected from Lingga Island, Indonesia, in 2018 (LR 18) compared with the 10-year-old samples from the same geographical region, Lingga Island (SC1-SC6). All spectra show the characteristic peaks as in the standard sample for trans-polyisoprenesBack to article page