- 1). Heat a pot of water over the stove and remove from heat when hot, but not boiling. Add a splash of vinegar to help set your color. Leave your hat to soak for 10 to 15 minutes. Remove the hat.
- 2). Fill a pot with sufficient water that the liquid will cover the hat. Then add either Kool-Aid in your chosen color or a few drops of frosting colorant to the pot of water. Warm the liquid on the stove and add your hat. Simmer for at least 15 minutes. Leave to soak for longer if a deeper color is desired.
- 3). Put on disposable gloves and remove the hat. Rinse in a little soapy water to remove excess dye and gently squeeze out the liquid.
- 4). Place the wet hat over your hat shaper, smooth in place and leave to dry.
Source...