Blue Indigo Laundry Whitener Natural Spa Supplies
True Blue Indigo Powder How do you use True Indigo as Laundry Bluing? There are two ways. In a Washing Machine. For washing whites in the washing machine, we place a tiny 1/4 tsp of Indigo Powder in a glass jar (ours held about 300ml of liquid). Make sure the lid fits well and that the jar is watertight. We add warm water and shake it to mix.