Test the color by using small cuttings of the paper rush. Two things will determine the intensity of color - the proportion of dye to water and the length of time the rush is soaked. The paper will dry quicker if the water is kept hot while dyeing. The burner can be left on low. Once the paper reached the desired color, remove it from the water and hang to dry.
Clothes hangers work very well for drying.
If you are dyeing the untwisted rush, it can be untwisted either while wet or dry. Also, remember that the colors will look darker when wet. Besides being less expensive than predyed rush, dyeing your own will allow you to have colors other than are commercially available. Don't be afraid to experiment, many dyes may be mixed to produce new colors. Fiber rush is available in 3 sizes and 2 colors, try some today.