Turmeric is a powder obtained from the ground-up tubers of Curcuma

tinctoria, a plant found in India and other Eastern countries. It

gives a brilliant orange yellow, but has little permanence. It is one

of the substantive colours and does not need any mordant. Cotton has a

strong attraction for it, and is simply dyed by working in a solution

of Turmeric at 60 deg.C. for about 1/2 hour. With silk and wool it

gives a brighter colour if mordanted with alum or tin. Boiling should

be avoided. It is used sometimes for deepening the colour of Fustic

or Weld, but its use is not recommended, as although it gives very

beautiful colours, it is a fugitive dye.