Congealed lump of latex
From Discworld MUD Wiki
A congealed lumps of latex can be scraped from rubber trees, which are found in the jungle.
They can also be bought at Mit-sin-bibh-khot's world of rare reagents inside the Institute of Illusory Learning, on the Avenue of the Pharaohs, Djelibeybi, for &&&&&&&&&&&&+400 DjToon 2.00 each.
Grinding them produces latex powder.
