What do you call phitkari in English?

Its called Alum..... Chemically it is Pottasium Aluminum Sulphate. [Wikipedia]

Usually in Indian Subcontinent familarly known as Phitkari. A White transperent Solid Crystal.

Used in Cleaning Water & In Barbar Shops to stop accidental cuts. Also uses include as Deodrant.

Other special uses include 1% to Harden the Gelatin in Photography. Gelatin becomes hard to be able to used as Photo resist for Screen Printing and PCB.

regards

Kaludi Noor

Pakistan