Effect on the acidity of the paper of five extracts of plants that possess activity biocide

It was valued effect of five natural biocides obtained from the plants Allium sativum Linn, Eucalyptus citriodora Hook, Pinus caribaea Morelet, Piper auritum H.B.K. and Ricinus communis Linn, on the permanency of the paper. The variables evaluated were alkaline reservation and pH, before and after an artificial aging by dry heat. They were not differences statistically significant when carrying the comparisons.