Silk Fiber, Cross-Section
This is a cross-section of silk fiber from the sample-set provided by Textile Fabric
Reflected Brightfield Illumination
Significance in the Environment:
This is a common clothing fiber.
Silk has a refractive index along its length of about 1.59 and perpendicular to its length of about 1.54.
It has a birefringence of up to 0.05 and a positive sign of elongation.