![Silk Fiber Silk-Fiber](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1I6oOsumThuR5QwJEwEv0nKm69x4zRGLlih-IplsGbRbyHvHiTriYOvTO0L9JHPk5XTuS9NmPSY0oiYv5fvVADOkgSi6klCfwhuI1XKD6y7DxQdkI1ZOYsQOttFlGbA2GXcqjMLHBwAY/s400/silk+fiber.jpg)
The main sources of Silk are Japan, France, Greece, Brazil, India, Austria, Spain, Turkey etc. The Composition of Silk fiber is Gum or sericin is 22-25%, Silk of fibroin is 62-67%, Water is 10-11% and Salt is 1-1.5%. The length of Silk is about 600m with the diameter of 12µm to 30 µm. The common color of Silk is Bright Yellow. Moisture regain of Silk fiber is 11%. And the tenacity of Silk fiber is 30-44 CN/Tex. To make a Silk fabric soft and glossy at first we must have to remove the sericin or gum by a treatment. This treatment is known as degumming. Basically this is a sourcing operation. At the temperature of 105º C Silk is treated with soap. When de-gumming is completed the weight of Silk fabric is decreased into one third. De-gumming Silk is known as soft Silk and with the gum or sericin Silk is known as hard Silk.