Many of my students seem to have difficulty when it comes to getting all the red Procion dye powder to dissolve. The picture above shows what happens when trace amounts of red that are not dissolved properly land on the fabric leaving spots or speckles of bright, bold color.
The solution to this common problem is very simple as you can see in the following video.
One of the key points is to use water that is warm to the touch. Be sure to make a paste first, and always filter any dye that contains even trace amounts of red in the mix.
Here are the results of the red that was filtered and "stuff and dumped" into a small container. No specks. Good mottling. Nice highs and lows of color.
Hope this helps in your quest for perfect results every time you dye using that pesky red powder!