I created the red onion skin dye bath by pouring boiling water over the onion skins and letting it steep. 3 pre mordant swatches were soaked in cold water for 15 min before being placed in the dye bath. This helps the dye disperse on the swatch more evenly. Without being soaked the fabric can have a blotchy and uneven appearance. I took out my three swatches, and put in three more and pre mordant swatches (Aluminum, Copper, Iron) and left them in the bath for 72 hours.