The definition of tincal is a crude type of borax, a cleaning material.(noun)
The cleaning product used by native tribes in Tibet is a an example of tincal.
See tincal in Webster's New World College Dictionary
Origin: Malay tingkal < Pers tiṅkāl, tinkar < Sans ṭaṅkaṇa
See tincal in American Heritage Dictionary 4
Origin: Malay tingkal.