If you haven't used up the concentrated dyes you have mixed from powder in awhile (over 2 months in the refrigerator), you may not want to risk painting on fabric with them as they might not have the intensity you are expecting. Rather than disposing of these dyes recently, I decided to low immersion dye some fat quarters. I figured I could always paint or dye over them if the colours weren't strong enough. I was very pleased with the results.
You can check here for information on low immersion dyeing at the Dharma Trading Company website. The first three photos are of cotton pieces dyed with a low immersion method. The three pieces of fabric were dyed in layers in one container. After lightly damping the fabric pieces with water, I scrunched one fabric piece in the bottom of a large yogurt container. I then drizzled on a few dye colours that were would be considered a dark mix. As I was using leftover dyes, I was not very specific about amounts.
Purple mixed from fuchsia and turquoise and black were the only two colours used in this fat quarter. You can image the fabric was loosely pleated before being placed in a small container. After letting all the pieces sit for about 15 minutes, I added a warm soda ash solution until you could just see the liquid nearing the top. I 'kinda' think of the similarity of adding milk to the layered potatoes when making Scalloped Potatoes. After leaving the fabric in their dyed containters overnight, I rinsed them and then washed them in a textile detergent.
Okay this following photo is just a teaser for a future post. The last two days were spent in fabric dyeing experimentation. If you like fabric dyeing, I think you will be loving this technique. My friend and I who have dyed fabric for years were excited with the technique.