I am going to say I am still learning a lot when it comes to indigo. I think it should be permanent and it is not. I think it should dye with out anything added to it. It does not.
But I am getting there. I have blue hands to prove it. Part of why I as working with the indigo was I had two shirts and one dress that were just too light. Or white. They needed to be another a color to be wearable. My Beloved does not wear white because he gets it too dirty too fast. I do the same.
Two of these garments are further changing by me making the short sleeved. I like to wear things out before I throw them out. But the colors are such that they will become cool quilts if they still do not work when worn.
I was also trying to change a length of weld dyed silk into more of a green. When it was on the line, it looked very aqua or ocean blue. It has dried and washed more of a light green. Someday I will figure out this color.
I have lots of fleece that I will wish to have a different color then the natural. Especially the whites and greys. I lean towards greens or blues naturally. If it is not black or brown.
More playing with this does need to happen. But maybe I will do a few other things first. There are only so many hours in the day. A corner shelf unit and a truck cabin may be soon!