One dyestuff company here employs over five hundred chemists.
Then wash the dyed silk and notice whether the dyestuff washes off or not.
The boxes may contain the same or different liquors, according to the nature of the dyestuff employed.
This dyestuff is largely used by calico printers and other dyeing manufacturers.
Which sample has absorbed the greatest amount of dyestuff from the liquid?
The dyestuff for black was a sediment or deposit of an intense black found at the bottom of pools in bogs.
Under the deep-furrowed, brown surface bark is a yellow layer, rich in tannin, and a dyestuff called quercitron.
The high price of this dyestuff causes its employment to be somewhat limited.
The goods are first warmed in the drum up to 140 F., and the dyestuff solution gradually run into the drum whilst it is revolving.
Since a fair amount of caustic soda is necessary for the setting of the vat, the dyestuff is not suitable for animal fibres.