Preferably NOT all-purpose. Some people claim that you can use all-purpose dyes in the washing machine. Unless your washing machine can heat water well above the usual temperature of the water heater (which is typically 120 to 140°F, or 49 to 60 °C), however, results will be less than optimal. All-purpose dye works best at the temperature of a simmer, 190-200°F, or 87-93°C; lower temperatures produce results that are duller in color and are not very wash-fast. Water that is hot enough for best results will often shrink garments, though, which can be a real problem with lined garments or garments that fit correctly before dyeing.