This is Rowan Kidsilk Haze in shade #613, Royal. It is a vibrant royal blue and is now discontinued.
It is a blend of 70% Super Kid Mohair and 30% Silk. It is gossamer fine and light as a feather and has a hazy bloom when knitted up.
Each 25g ball is 229 yarns and it knits on US #3 - #8 needles depending on the pattern. It is machine washable in cold water.
Used principally for shawls and wraps, this is a versatile yarn that can be knitted double for more substance or knitted along with another yarn to add a special look.
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