Aston B. C. 1919. Indigenous tans and vegetable dyestuffs of New Zealand. New Zealand Journal of Agriculture 17: 136-139
Further tannin assay results. Richest bark Weinmannia spp. Further dyeing experiments with Coprosma species. Each of 40 species has distinct character with regard to colour reaction of its bark to alkalis. Colour of cortex also generally characteristic for each species.
Indigenous tans and vegetable dyestuffs of New Zealand