After praying the silk by stretching it on a frame, then adding resist lines, I began. I found the Inketense must be used wet on silk, either by wetting the silk first and applying the color or wetting the color and applying it to the silk. They simply do not work dry on dry. Also, the colors need to sit for 24 hours, then should be heat set. I did this, then rinsed out the resist lines the next day to find that, once the silk painting dried, the color faded some and it was not as intense as before the rinsing. After it dried, I pressed it and all was well. I compared the Inktense on silk and on paper. The final results are below. The piece on paper is on the left, the one on silk is on the right. The second photo is of the pieces before rinsing out the resist. You can see how bright the colors are on the silk piece ( lower right) prior to rinsing.
Consensus- while Derwent Inktense are good on paper, I don't think, except for small details, I'd use them on silk. I definitely wouldn't use them on silk wearables, just on wall art. 
