Silk Thrums – what DO you do with them??
Silk thrums are gorgeous, jewel-like bits of temptation, rich in colour, shiny and sparkly, promising all sorts of lovely uses that will amaze everyone. Or not. Silk thrums are one part of the left overs from the sari silk industry. This is what can’t be woven on the loom and has to be cut off. I would like to see how saris are woven to understand the way the wastage is generated, it still puzzles me, but silk thrums are available in vast quantities to crafters all over the world. The problem with sari silk, and its a huge problem, is how the silk is dyed. There do not appear to be industry standards for colour fastness. Silk is a tricky fiber on a good day, so if dyers can’t determine dye acidity, water temperature, water hardness, or can’t properly degum the silk, the dye will run. I decided to try to use this characteristic of sari thrums to an advantage to see if there could be any benefit to be had.
I took a brilliant red thrum, trimmed the ribbon end and trimmed some silk fibers. The ribbon was soaked in hot water to leech out the dye. The colour saturation was evident as soon as the ribbon was in the jar. The water was totally red, but there is no way to do any metrics on this because the original silk was dyed with an unknown quantity of dye. All this is just a “see if this works” experiment. I snipped a tiny quantity of silk fiber, set it aside to mix with the wool roving I had chosen for dying.
I spun the rest of the silk threads into a single ply yarn. I’m taking a liberty in calling this a single ply, it is in fact a multiple thread yarn. The sari silk is made up of extremely fine thread. I respun those into a single thread with added twist. I can’t show them to you because my camera just can’t pickup the delicacy of those threads.
It was difficult to spin at first, because the fibers are nearly 36 inches long and tended to get tangled. I’ll try a different method next time, but it is possible to spin this into a reasonably nice yarn. The single yarn is plied against some of the merino top that is the basis of the dye bath test. I’ll use this later as part of the dye test.
When I plied the single merino wool with the single red silk they worked well together This is the most durable, hard to break fiber I have ever handled. Silk really is amazing.
I presoaked the remaining merino, drained, opened it along a mid-seam, sprinkled the snipped silk threads all along the centre. I then rolled the merino into a tube and wrapped it with the ribbon from the soak jar. This was set in an acid bath and topped up with the dye water from the soak jar. I use an oven to dye my wool. I cooked this for about two hours at 100C/220F. I expected a more vibrant red, not the pale orange, but this is an experiment, so expectations have to go on the back burner.