Abstract
Condensed tannins extracted from the seed testa of Anacardium occidentale is subjected to phytochemical and spectral studies such as UV and 13 C NMR. Shell of Cocus nucifera on treatment with acid yields acid hydroxylates containing furfural which when condensed with tannins of A. occidentale form phenol–formaldehyde type resins. The spectral and physico-chemical properties of the resins are studied. Varnishes are prepared from these resins using linseed oil/linseed oil–tung oil. The service performances of the varnishes including their impedance spectra are evaluated. The results show that varnishes with good gloss and chemical resistivity can be prepared from these waste materials.
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