Aluminium
potassium sulphate dodecahydrate (KAl
(SO4 ) 2 . H 2O), f e r r o u s s u l p h a t e
heptahydrate (FeSO4.7H2O), stannous
chloride (SnCl2.2H2O) and copper
sulphate pentahydrate (CuSO4.5H2O)
were laboratory grade and used as
mordants. All chemicals were purchased
from suppliers in Bangkok.