 Along with the ice other ingredients such as water, salt, sawdust, wheat husks and charcoal are also placed at the site.The use of glacier grafting is an old skill of the mountain farmers of Baltistan and Gilgit, where it is used for irrigation purposes since at least the 19th century.This technique was described by Lieutenant David Lockhart Robertson Lorimer (1876–1962) in the 1920s.