Recycled sari silk is one of my favorite yarns. I always feel as though the yarn tells a story because so many women have touched these fibers and it has traveled so far to be on my knitting needles or crochet hook. It has had an adventure before it becomes the garment you are making.
Saris fabrics in South Asia are made mainly of silk, cotton, rayon and a few other synthetics. The high quality fabrics are silk whereas the rayon or synthetic fabrics are the cheaper substitute. With this in mind, when you purchase recycled sari silk yarns you may find that you yarn is a mixture of these fibers or it may be 100% silk.
Before I go any further, having a recycled sari silk yarn that is not 100% silk does not mean the yarn is any less fabulous. It really is a personal choice and can depend on individual skeins...as crafters and yarn lovers we all know you can have some lovely yarns that are made with cotton or rayon...so really it is like comparing apples to apples in a sense. Some people may prefer to have cotton or rayon because they do not like wearing yarns made from animal products.
But if you are wanting your recycled sari silk to be silk, then it is important to know how to tell the difference.
The first thing you can do is to smell your yarn....the more silk you have the more your yarn will smell "funny"...after all silk is an animal product so you should not be surprised about this. I have had friends talk about the smell of some recycled sari yarns thinking it was from some cleaner used on the fibers....well actually it is from the silk (if it is silk). (I love these homemade natural cinamon candles that my friend makes and I have them not too far from where I keep my silk yarns because it helps counteract the smell of the silk)
The second method is to burn your yarn. This is a bit unrealistic when you are out buying yarn at a shop or online. I actually test my recycled sari silk yarns for their content often but I do this in a very safe way. For those pyromaniacs out there you can tell your fiber content by the way it burns (yes this works for other yarns too!).
If your yarn is an animal fiber it will burn reluctantly with a crackling sound. The fire should die out easily or even on its own. You will have that distinct "burning human hair" smell. If your yarn is silk it will turn into silvery clumps that crumble easily (make sure it is cool before touching!).
If you yarn is a plant fiber (ie. cotton), it will burn really well with a very bright flame. The fibers will still glow when the flame is put out. It will smell like burned paper (so it will not be a noxious smell like animal fibers produce). But remember, rayon is a plant fiber!
If it is synthetic, then the yarn will burn like plastic. They usually burn really well and when cooled the "mess" that was your yarn will be a hard clump that does not crumble. The smell will be like burning plastic as well....so it will stink and the fumes could be harmful.
We tested our sari silk yarns when we got them in and they silk. The smell before and after burning gave it away...not to mention the mess of silvery clumps I had disintegrating everywhere! But since we work with a community in Nepal for our Recycled Sari Silk yarn, we expect that the odd skein may have a few rayon fibers in it just because of the way the yarns are produced. I am sure this is an issue with all recycled sari silk yarns. After all, most of the communities get their remnants from a factory and they cannot afford to test every fiber that passes into their hands. Regardless, the women we help try to give us an amazing product and we have been very happy with their results. I am just in love with the solid colours (especially the teal and dark pink colour).
This month we will be releasing a new 100% silk yarn that comes from a community in India. This yarn is carded much better than the sari silk yarns so it is a smoother, finer yarn. I am very excited to get my hands on this yarn. The colours are vibrant which is similar to the sari silk so I am sure you will love it too! Silkworms produce the silk when they create their cocoons (photo below).
If you choose to ever burn your yarn to test it PLEASE be very careful because if you yarn has any synthetic materials in it, the fumes from burning can be harmful to you, your loved ones and your pets.
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