Procion MX dyeing on cotton/linen fabric

I've decided to dye linen/cotton with Procion MX dyes using soda ash and do some experiments to see if I like this process. Below are four pics of my first attempt at ice cube dyeing. It's on linen/cotton rough weave medium to heavy weight. The colors aren't as strong or bright as  I had hoped, so next time I will sprinkle more dye.

This one has "freckles" where the dye powder did not get as wet and just sat on the surface of the fabric.

Ice cube dyeing is putting ice cubes on top of the fabric and sprinkling dyes on top.
The cubes slowly melt moving dyes around and the dyes strike at different
times as it hits the fabric.

There is a spot where the dye powder was still dry on the fabric and did not get wet.

Below is a hexagon clamp resist piece and leftover dyes were used. The darker spots are navy dye that had a lot of Superclear in it which was hard to rinse out. It back-dyed on some areas.

Below is a hexagon folded but not clamped piece using leftover dyes again. Both the one above and this one had intense dye on them (not as diluted) so the colors are more brilliant. Both are the same medium to heavy weight rough weave linen/cotton fabric.

Using the navy mixed with SuperClear (not straight solution but 50/50 with water) I stenciled onto the same fabric. It was hard to get the dye all the way through at first. Notice how light some areas are where I didn't continue to rub the stencil brush over and over.

Dye didn't go all the way through the stencil. Light areas can be seen here.

The Superclear was hard to wash out and I wanted to see if I wasn't careful how much would dye-back onto the fabric as can be seen below. I may try rice paste or some other medium to stencil with.

Back-dyed spots on the right hand side.

Back-dyed spots.

The reverse side of this medium to heavy weight linen/cotton fabric didn't get dyed as well. Needed to work the dye through the stencil some more.