The product I have used the most to thicken my dyes however is called No-flow which is made by Jacquard. It is a liquid starch-like product that I have used for many years in my landscape paintings on silk as well as on my silk scarves and ties.
In this video I am painting a silk scarf with Dupont French steam set dyes that I thickened with No-Flow I coat the silk with the No-Flow and then let it dry completely. I sometimes add a small amount of alcohol to the starch first to loosen it up before adding it to the French dyes. Be sure to thoroughly mix the starch with the dye by whisking it.
The pen I am using in the video to draw the back lines is a refillable Molotow pen that I have filled with black Dupont French dye. This method only works with dyes, it will not work with silk paints.
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My silk scarves, ties and fine art prints can be purchased online in my Etsy Shop.