It can be used as both an after-bath to adjust an alum-mordanted color, or it can be used as a pre-mordant on its own. Will tend to turn colors more blue/green. Unlike iron compounds, will not rough up protein based fibers. Typically produces a more colorfast result than fiber dyed with alum.
- Alternative Names: Blue Vitriol, Bluestone, Cupric Sulfate, Copper Sulfate or Cupric Sulphate Pentahydrate
- Function: Mordant
- Form: Crystalline
- Typical Use Rate: 1 ounce per pound of fiber
- Package Size: 4oz.