H. J. Murton, Journal of the Straits Branch of the Royal Asiatic Society (1878)
“ The only other Gutta Percha that I have seen is Gutta Puteh the product of I. macrophylla; the tree differs from I. Gutta in the shape and colour of its leaves, and is readily recognized at a distance by the Perak collectors. This Gutta is obtained in the same way as the former, but is worth only about $15 per pikul. It differs in appearance from G. taban in being white, more spongy and less plastic; but it is often found adulterated with G. jelutong, which causes it to be brittle and almost useless. The trees of each species yield about 23 catties of Gutta each. ”
