Origin of copperas
Examples from the Web for copperas
Historical Examples of copperas
It was black, but the copperas would eat the paper after a while.The Story of Young Abraham Lincoln
Alum and copperas have been known in the Highlands long ages.
Put the wool into this for 1/2 hour; then return it into the alum and copperas for 10 to 15 minutes.
We're goin' up to Copperas Creek and there ain't a thing in that.Mitch Miller
Edgar Lee Masters
The amount of copperas should be from one and a half to twice that of the indigo.The Dyeing of Cotton Fabrics