Fig. 1
pH of rag (squares), groundwood (circles), and bleached pulp (triangles) papers as a function of the approximated publication date. The error bars indicate the instrumental errors for each paper type
Fig. 1 | Heritage Science
pH of rag (squares), groundwood (circles), and bleached pulp (triangles) papers as a function of the approximated publication date. The error bars indicate the instrumental errors for each paper type
