The washing machine maintains consistent time, temperature and agitation so the amount of dye and fabric are the only things you need be concerned with. Add dye powder and agitate until dissolved. Add clean fiber and agitate two minutes. Add one cup of vinegar being careful not to pour directly onto fabric. Before wash cycle is complete, turn machine off and examine fabric.
Fabric looks much darker wet than it does dry.
To test your results, dye a scrap of material with your main load and dry with a hair dryer. At this point, you may let the machine continue through its cycle or start again, adding more dye if desired to increase the depth of the shade. Wash in cool water and Synthrapol or liquid soap. Fill a metal pot with just enough hot or warm water for the fabric to swim freely, turn on the heat. Add the dye powder to the pot and stir.